Vague idea to detailed image prompt refiner

Paste a rough idea and get back polished, structured image prompts, plus the choices the model made so you can steer the result.

Change note: Initial version

Prompt

You are an expert at writing prompts for text-to-image models. I will give you a rough idea. Turn it into strong, specific prompts.

My rough idea: {{idea}}
Where the image will be used: {{purpose}}
Look I'm after: {{look}}
Things to avoid (optional): {{avoid}}
Target tool: {{tool}}

Process:
1. Identify the subject, setting, action, mood and anything vague or missing. Fill gaps with the most likely intent rather than asking me questions.
2. Write three prompts of different directions (for example realistic, stylized, minimal). Each should be a single paragraph of 40 to 90 words ordered by importance: subject, details, setting, composition and camera, lighting, style and medium, color palette. Use concrete nouns and visual terms; avoid filler such as "masterpiece", "ultra HD" or "trending".
3. For each prompt add a short negative prompt line or an "avoid" clause, formatted to suit the target tool.
4. List the five assumptions you made, so I can correct them.
5. Give three one-word tweaks I could append to change the result (for example lighting or era).

Format: headings per prompt, then assumptions and tweaks. Do not mention any model version.

Variables

• {{idea}}Rough idealongrequired

  Default: a cozy reading nook on a rainy day

  A few words is fine

• {{purpose}}Purposetextrequired

  Default: Blog header image

• {{look}}Lookselectrequired

  Options: Photorealistic, Illustration, 3D render, Watercolor, Cinematic, Minimal flat

  Default: Photorealistic

• {{avoid}}Things to avoidtext

  Default: people, text, clutter

• {{tool}}Target toolselectrequired

  Options: Midjourney, Stable Diffusion, Flux, ChatGPT image, Gemini image, Other

  Default: Midjourney

Example output

Prompt 1 (realistic): Cozy reading nook built into a bay window, deep green velvet cushion, a worn paperback and steaming mug on the sill, rain streaking the glass with a blurred gray garden beyond, warm lamp glow against cool window light, soft wool blanket, shallow depth of field, 35mm lens feel, eye-level composition with space on the right for a headline, muted green, cream and amber palette, photorealistic. --no people, text, clutter

Prompt 2 (illustrated): A flat-color illustration of a window seat with stacked books and a mug, raindrops as diagonal lines on the glass, warm yellow lamp, teal and rust palette, simple shapes, gentle texture, horizontal composition. --no people, text

Prompt 3 (minimal): Minimal composition, single armchair beside a rain-spattered window, beige wall, one lamp, large empty space, soft diffused light, muted tones, photographic.

Assumptions: 1. Horizontal 16:9 for a blog. 2. Evening or overcast daylight. 3. No people. 4. Autumn feel. 5. Space reserved for a headline.
Tweaks: golden-hour, moody, vintage.

Notes

Ordering a prompt by importance gives the subject the most weight. Reviewing the assumptions list is the fastest way to steer the next round.