I haven’t used Flickr in years (I still have an account and I’m still struggling with the idea of deleting it) but I’m still a big fan of its URLs. This pattern in particular is my favorite:
flickr.com/photos/[someone]/[photo-id]/in/set-[set-id]
When I was building my own photo album I took inspiration from that pattern for my in-album navigation. Example: https://album.antiorario.it/media/4691/in/108. I also used that principle at my previous job for a similar concept—and years later the site I built is still using it. I don’t feel like linking to it, but I can give examples if asked.