Short answer: A good image prompt clearly describes the subject, setting, style, composition, and important details.
Steps
Start with the main subject.
Add the setting or background.
Describe the visual style, lighting, camera angle, and mood.
Include important constraints, such as colors, layout, or what should not appear.
Generate, review, then revise one part of the prompt at a time.
Notes
Strong prompt: A cinematic close-up portrait of a ceramic robot barista in a neon Tokyo cafe, soft backlight, shallow depth of field.
Weak prompt: cool robot picture.
[Screenshot placeholder: prompt field with highlighted subject, style, and composition terms.]
Troubleshooting
If the image ignores an important detail, move that detail earlier in the prompt.
If the image feels cluttered, shorten the prompt and focus on one scene.