Alright here's how to get all the photos as of now:
1. Wait for a blue-haired girl to come next to the store, then take off her pants and undo her blouse (click on her model, not the UI buttons). Without unfreezing time, exit the interaction menu and snap a picture of her.
2. Find a red-haired girl and pose her against the red brick wall. Remove everything but her shoes and take a picture while in the 4th sex position.
3. Find another blue-haired girl and undress her down to her panties and shoes. Without letting go of the camera button, exit the interaction menu and unfreeze time. Photograph her reaction.