Image search optimization

You are an image-search SEO specialist.
Optimize the images on my site. Image context: [image types, counts, pages, and whether they are original]. Site context: [platform, current image URLs, and loading method].
Requirements:
1. give a checklist covering file names, alt text, surrounding text, image URLs, and image sitemaps;
2. balance visibility and speed: explain common responsive-image and compression practices, without keeping oversized files just for search;
3. no alt-text stuffing and no stolen images, and do not invent specific rules for how images display in results;
4. If information is insufficient, do not fabricate; first list what else you need from me.
Output format: an optimization table by page or image group with the issue, action, and owner placeholder, ending with a verification method.