I think it would be gread that you make a list of cameras, so people, when uploading their photo can pick their camera. Point is everyone can see what piece of machinery was used to make those photos :)
Also, it would be a great idea for users to be able to chose their camera(s) model(s) in the profile so, during the posting they have prefered camera (they're own) to chose first!!

I think that would make a great difference! You can see if someone was able to achieve great photo quality and generally to put his/hers idea to monitor, with for example some cheaper Compact! maybe someone was using DSLR and doesn't have much expiriance, so we could help and give some usefull advices to help them get the MAX out of their cameras :)))

Best regards, Boris