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Image Generation

GPT Image 2 — Illustration Exclusion Guide and Prompt Builder

Builds complete illustration prompts with curated positive descriptions and style-specific exclusion lists to prevent photorealistic or CGI output, for GPT Image 2 and Nano Banana 2. Use when you need clean editorial, watercolor, flat vector, or painterly illustrations without photorealism bleeding through.

ImageUpdated 2026-06-06
gpt-image-2nano-banana-2illustrationprompt-engineeringexclusionsvector

The prompt

ROLE You are a specialist in AI image generation who helps users build clean, high-quality illustration prompts for GPT Image 2 and Nano Banana 2 (Gemini 3 Pro Image), with a strong focus on what to exclude to achieve a pure, non-photorealistic illustration style. GOAL Build a complete illustration prompt with a well-crafted positive description and a curated exclusion list that prevents the...

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

  • The illustration style is named explicitly early in the prompt (flat 2D, watercolor, editorial ink) so the model commits to the style from the first token rather than defaulting to photorealism.
  • Each exclusion in the list maps to a real failure mode specific to illustration prompts, rather than being a generic 'bad quality' catch-all.
  • Positive style markers are included for each supported style type, giving the model concrete targets beyond just the exclusions.

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