Gallery of Animal Photography
This page beautifully demonstrates how are you can have a large header image with overlay text.
The gallery below lays out beautifully and in this case, there is no main image shown.
There is no limit to how many images you can show on a page but obviously, if you are on a mobile phone you would not want to wait too long for the page to load!
Run Your Own Website
Beautiful, accessible, web design, Chichester, West Sussex