Gemini trend Nano Banana Prompts for Chilling Halloween Photos — 20 Free Copy-Paste Prompts

Turn one photo into spooky-cool art with Gemini’s Nano Banana. This guide explains the 1-photo workflow, common pitfalls, and 20 free, copy-paste prompts for high-separation Halloween edits.

Each is a structured JSON-style instruction block. Replace {YOUR_NAME} if needed. Feel free to shorten. Following is the reference photo I used for the prompts.

{ "task": "edit_photo", "theme": "haunted victorian portrait", "identity_constraints": "Preserve facial identity and bone structure of {YOUR_NAME}. Keep skin undertone.", "pose": "Half-turn over right shoulder, chin slightly down, eyes to camera, relaxed expression.", "wardrobe": "Tattered black high-collar coat, subtle lace, no blood.", "environment": "Rain-sheened window, faint city rooflines, drifting fog outside.", "props": ["old brass lantern with dim flame"], "lighting": "Moonlit rim light from left, cool blue grade, gentle halation.", "camera": "50mm equivalent, shallow depth, slight vignette.", "composition": "Rule of thirds; window muntins create cross-frame.", "effects": ["light fog", "film grain"], "negative": ["gore", "distorted hands", "extra fingers", "illegible face"], "output": {"aspect_ratio": "4:5", "background": "kept"} }

{ "task": "edit_photo", "theme": "pumpkin carving den", "pose": "Lean forward at workbench, carving gesture with safe stance; friendly half-smile.", "wardrobe": "Dark denim apron, rolled sleeves; witch-hat costume optional.", "environment": "Wood table with pumpkins, candles in jars, paper stencils.", "props": ["pumpkin scoop tool", "tea-light candles"], "lighting": "Warm candle key, cool window fill; orange/teal grade.", "camera": "35mm storytelling angle, slight above-eye perspective.", "motion": "Carving shavings mid-air; shallow depth on hands.", "identity_constraints": "Preserve facial identity.", "output": {"aspect_ratio": "3:2", "background": "replaced"} }

{ "task": "edit_photo", "theme": "long exposure ghosting", "pose": "Take two steps forward; cloak trailing.", "environment": "Cobbled alley, sodium streetlight haze, faint mist.", "effects": ["double exposure trail", "motion blur", "soft bloom on highlights"], "wardrobe": "Minimalist hooded cloak (no logos).", "lighting": "Back rim from streetlight, cool front fill.", "identity_constraints": "Keep face readable despite motion.", "negative": ["hard gore", "broken anatomy"], "output": {"aspect_ratio": "9:16", "background": "replaced"} }

{ "task": "edit_photo", "theme": "cemetery night", "pose": "Kneel by weathered headstone, lantern raised in right hand; gaze off-camera left.", "environment": "Twisted tree silhouettes, drifting leaves, iron fence.", "lighting": "Cold blue rim from behind, warm lantern key on face.", "camera": "Low angle 28mm for towering trees; light vignette.", "effects": ["subtle fog", "starless night"], "identity_constraints": "Preserve identity and skin tone.", "output": {"aspect_ratio": "4:5"} }

{ "task": "edit_photo", "theme": "cyberpunk halloween", "pose": "Stride toward camera, coat flaring; confident expression.", "environment": "Rainy neon alley; holographic bats flicker above.", "lighting": "Magenta/cyan signage, glossy reflections on ground.", "camera": "35mm, eye-level; slight chromatic aberration.", "effects": ["neon bloom", "wet asphalt reflections"], "output": {"aspect_ratio": "1:1"} }

{ "task": "edit_photo", "theme": "silent film frame", "pose": "Dramatic side glance, hands clasped mid-fear (anatomy clean).", "environment": "Stage flats with heavy shadows.", "effects": ["monochrome", "film scratches", "vignette", "title card border"], "lighting": "Hard key + deep shadows; chiaroscuro.", "output": {"aspect_ratio": "4:3"} }

{ "task": "edit_photo", "theme": "abandoned funfair", "pose": "Candid laugh, cotton-candy prop; wind lifts hair.", "environment": "Broken carousel, distant ferris wheel; drifting confetti.", "lighting": "Sodium fairground bulbs; green ghostly fill.", "effects": ["dust motes", "soft lens flare"], "output": {"aspect_ratio": "3:2"} }

{ "task": "edit_photo", "theme": "x-ray illusion", "pose": "Stand tall, chest angled 30°; hands visible, normal anatomy.", "effect_method": "Overlay tasteful ribcage/x-ray graphics aligned to body.", "lighting": "Cool cyan edge, neutral key.", "negative": ["medical gore", "injury"], "output": {"aspect_ratio": "4:5", "background": "kept"} }

{ "task": "edit_photo", "theme": "gothic cathedral", "pose": "Hands together holding taper candle; eyes up to stained glass.", "environment": "Stone arch, stained-glass bloom, wax drips on rail.", "lighting": "Candle key; stained glass spill colors.", "camera": "Low angle for grandeur.", "output": {"aspect_ratio": "2:3"} }

{ "task": "edit_photo", "theme": "haunted coffee shop", "pose": "Seated at window, sipping cup with jack-o’-lantern sleeve.", "environment": "Café interior + fog outside; tiny ghost stickers on glass.", "lighting": "Warm interior, cool exterior contrast.", "effects": ["bokeh bats", "light rain on window"], "output": {"aspect_ratio": "4:5"} }

{ "task": "edit_photo", "theme": "vampire couture", "pose": "Chin up, hair wind; cloak swirl.", "wardrobe": "Velvet cape, subtle fang hint (no blood).", "lighting": "Beauty key with deep red rim.", "composition": "Magazine cover crop; negative space for masthead.", "output": {"aspect_ratio": "4:5"} }

{ "task": "edit_photo", "theme": "lycan silhouette", "pose": "Side profile, howling gesture; keep face yours but add shadow muzzle illusion.", "environment": "Big moon halo, pine ridge silhouette.", "effects": ["mist", "rim light"], "negative": ["graphic transformation gore"], "output": {"aspect_ratio": "16:9"} }

{ "task": "edit_photo", "theme": "levitating library", "pose": "One hand open, books orbit; eyes to camera.", "environment": "Dusty shelves, ladders, desk lamp glow.", "lighting": "Warm lamp key, cool ambient fill.", "effects": ["floating pages", "dust motes"], "output": {"aspect_ratio": "3:2"} }

{ "task": "edit_photo", "theme": "misty bog", "pose": "Staff in left hand, right hand conjures tiny blue flames.", "environment": "Reeds, water mirror reflections, low ground fog.", "lighting": "Green-blue bioluminescent accents; soft moon fill.", "output": {"aspect_ratio": "4:5"} }

{ "task": "edit_photo", "theme": "haunted mirror", "pose": "Face to mirror; reflections diverge at different angles.", "effects": ["kaleidoscope split", "silvering cracks (fine)"], "lighting": "Cool top light; face clean.", "output": {"aspect_ratio": "1:1"} }

{ "task": "edit_photo", "theme": "porch night", "pose": "Walking with candy pail; playful grin.", "environment": "Suburban porches with pumpkins, warm string lights.", "lighting": "Warm porch keys, cool night shadows.", "motion": "Falling candy wrappers, crisp shoes.", "output": {"aspect_ratio": "4:5"} }

{ "task": "edit_photo", "theme": "astral halloween", "pose": "Astronaut stance; visor reflects jack-o’-lantern face decal.", "environment": "Crater ridge, earthrise, star haze.", "lighting": "Harsh rim, deep space blacks.", "negative": ["copyrighted logos"], "output": {"aspect_ratio": "16:9"} }

{ "task": "edit_photo", "theme": "1980s halloween party", "pose": "Hands mid-dance; cheesy thumbs-up.", "effects": ["VHS scanlines", "timestamper 1988-10-31 23:59", "chromatic fringing"], "lighting": "Flashbulb pop + colored gels.", "output": {"aspect_ratio": "4:3"} }

{ "task": "edit_photo", "theme": "marigold altar inspiration", "pose": "Calm, dignified portrait; gentle smile.", "environment": "Cempasúchil (marigold) petals, papel picado, candle altar.", "palette": "Marigold orange, deep indigo, magenta accents.", "note": "Respectful cultural homage; avoid caricature.", "output": {"aspect_ratio": "4:5"} }

{ "task": "edit_photo", "theme": "windstorm rooftop", "pose": "Cape flares left; body 30° turn; broom prop angled forward.", "environment": "Rooftop shingles, lightning at distance, fast clouds.", "lighting": "Cool storm key; warm window glows below.", "motion": "Wind-swept hair; raindrop streaks.", "output": {"aspect_ratio": "9:16"} }

Q: Can I blend two photos (me + friend) into one Halloween scene?
A: Yes. Ask to “merge two uploaded photos into one scene” and describe who stands where and which props they hold.

Q: My prompt keeps getting blocked.
A: Use costume-style, generic horror descriptors; avoid trademarked character names and graphic gore terms.

Q: How do I keep my face consistent while changing pose?
A: Say “preserve facial identity and bone structure; keep skin tone,” and limit extreme FX to the background, not the face.