At the bottom left is the button for the photo collection. The first page shows you the photos you can sell, but then there are toggle buttons to go through all categories where you can see your collected photos and how much more you can unlock :)
Can we get subcategories on the Hypnosis tab? I'd like to get all pictures, but how do I tell when to upgrade from Topless to Nude, etc?
I'm releasing an expansion to the photo collection with the next update that will help you with just that. :)
Already teased on patreon and will come to itch.io later in June.