Image gallery page with very similar pictures

[audiosavas]

What measures should I take for a photographer's portfolio website with image-heavy gallery pages withotu content? Galleries are separated to different categories - weddings, fashion, beauty, thus having very similar content. What is better for example this page images https://www.karolinnafoto.lt/beauty/

1. Use no titles and alts so as not to repeat and not be penalized?
2. Repeat same titles and alts like "beauty portrait 1" "beauty portrait 2" etc.?

Or are there better measures to take to have this website more optimized?

[paints-n-design]

the galeries are image-only. So you will not see them in SERPs for any querry without brandname I am sure. No Penalty for same alt and title, its better to use allways the same alt for the same image.

What these Galerys are: Thin content and maybe duplicate content - because no content but images. Additional information for the images (maybe on hover, next to the best or most important once) and some content about the galery could be a solution.