Generates or edits images with the configured image-model role.

<instruction>
- Write one detailed `subject` for generation or editing.
- Multiple `input`: identify each image's role in `subject` (for example, `Image 1` composition; `Image 2` lighting).
- Specific catalog model required? Set `model`; otherwise omit it.
- Text: request "sharp, legible, correctly spelled"; keep it short.
</instruction>