Help me optimize images on a page for SEO.
PAGE TOPIC / KEYWORD: [[KEYWORD]]
IMAGES (describe them): [[IMAGES]]
For each image, advise on:
1. A descriptive, keyword-aware filename
2. Useful alt text (accessible, not stuffed)
3. Caption (if it adds value)
4. Format & compression recommendation for speed
5. Whether it qualifies for image-sitemap/structured data
Plus: general rules for image SEO and the mistakes that hurt page speed.