In the current version, you have an option to upload at least one picture to the album if they want to see others users pictures.
I added this for one of my sites and works well. Most users just register to see other pictures, and if they can not see, them upload a picture.
But users will try anything... and will upload some picture taken from elsewhere. So, if you force them to upload a picture to see other users images, I recommend to moderate the uploaded pictures for new users. This can be done by removing the capability akuc_unmoderated from the new registered users role. In this case, the users don't see other users pictures until their picture has been approved.
You can manage this capabilities and create new roles by using my plugin Capability Manager: http://wordpress.org/extend/plugins/capsman/
If you think it should work in another way, or limit more users with no picture uploaded, please, let me know how you think it can work.