We've tried several different approaches. Vertically split 50/50 produces best results. In most case users don't have to think how it works - they just upload their photos and they work fine. Single photo for a couple, same as single profile for a couple is a diversion to entirely different vision of how couple profile should work, and we've been trough many disputes about this already. Opinions vary. So, in this update, we don't do any structural changes, concentrating on presentation mainly, and see more this is the way couples leek better than they used to, while retaining existing profile structure.