You can see the following curated prompts used by a real product
Check ideal-landing-page-prompt.txt and then see GetCompress.com in action.
If you need to quickly and easily prepare production-grade assets for your website, consider using GetCompress: a lightweight desktop app that quickly compresses videos, images, GIFs, and PDFs in batches: enjoy up to 90% smaller files with minimal quality loss, all offline and secure on your device.