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👨‍🏫 Tutorial I Built A GPT For Structured Image Prompting Using Node_Graph + AST Logic

D

Diego Mendoza

Elite
Screenshot_2026-05-01-18-02-42-391_org.cromite.cromite.webp


I built a custom GPT that helps turn image ideas into more controlled, generation-ready prompts.

What it does​


Instead of only writing a normal prompt, it breaks the idea into a visual structure: image type, subject, composition, style, lighting, aspect ratio, negative prompt, and a compact final brief.

It is useful for:

  • cinematic or photorealistic scenes
  • posters and symbolic concepts
  • character design
  • infographics and layouts
  • product visuals
  • anime or illustration prompts
  • transforming reference images

The main goal is to avoid vague prompt language and make each detail actually affect the final image. It helps clarify what the image should show, how it should be composed, and what the model should avoid.

How to use it​


You can give it a simple idea like:

“A futuristic monk meditating inside a ruined cyberpunk cathedral”​

Or a more specific request like:

“Create a vertical poster of a lone astronaut standing in a desert, looking at a giant cracked moon, with a minimalist sci-fi style and no text.”​

You can also use it with uploaded reference images when you want to preserve visible traits, composition, identity, clothing, pose, or style while transforming the image.

The best way to use it is to describe:
  • the subject
  • the style or mood
  • the setting
  • the purpose of the image
  • any text that should appear
  • whether realism, symbolism, or layout clarity matters most

The GPT will then output a prompt package after giving your ideas. I put sections 2-5 inside a code block for easy copy/paste to ChätGPT for image generation. Copy those sections to generate your image.

​

Why Use It​


A lot of image prompts become too vague, too decorative, or too overloaded with buzzwords. This GPT is designed to make every part of the prompt serve the final image. It keeps creative flexibility, but anchors the concept with concrete visual details.

The main idea is to combine the readability of a normal image prompt with the structure of a semantic graph and AST, so the output is easier to refine, reuse, and adapt across different image models.

Takeaway​


This GPT is for people who want more control over image generation without manually writing huge production prompts. It is useful when you want the image model to understand not just what to draw, but how the subject, composition, lighting, symbolism, typography, and style should work together.

Feedback is welcome — especially from people who test it on complex concepts, posters, character designs, or reference-image transformations.

Try and test it here:​

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Example:​


Poster, Retrofuturism, lone astronaut, 50s space race, halftones, colour blocking, space, rocket, moon, advertising, bold tall text

file_000000003bd871f8b880934a5856a3a8.webp


2 sê×ÿ anime goddesses, legs showing, lace stockings, long hair, mischievous pose, video game characters, elaborate dresses, long capes, laces, low cut front, perky

file_00000000fad471fab300736c8d208e1e.webp

​

Your feedback is highly appreciated​

😎​

​

Support my other posts 🙏
 
5 panel split, split vertically, 3:1, 5 female main heroes, anime, elaborate costumes, RPG, different hero roles, sê×ÿ heroines, perky, legs, long hair, diversity

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