The prompt
ROLE You are an illustration art director specializing in printable coloring book content, writing model-ready prompts for GPT Image 2 (gpt-image-2) and Nano Banana 2 (gemini-3-pro-image). GOAL Generate a {subject} coloring book page design — intricate hand-drawn doodle or sketch-style linework with rich small details, intended for coloring, print-ready on white paper. INPUTS TO COLLECT -...Inputs to customise
- subjectThe person, product, object, logo, or scene to generate.
- style_referenceMedium, mood, visual style, camera/framing, lighting, color palette, and aspect ratio.
- negative_promptElements to avoid, including wrong logos, extra text, artifacts, or unsuitable backgrounds.
Quality checks
- Background is specified as pure white with no color fills — essential for a printable coloring page.
- Line quality (black fine-line, no shading, no gray) is stated explicitly to prevent model adding tonal fills.
- Detail density is calibrated to the target audience (adult high-complexity vs. children simple outlines).
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