What do you think of these photograpy business names?

I'd go with Perfect Portraits, it has less gender bias so would appeal to men as much as women, you don't want to discourage half your potential market. Also Pretty Portraits could be seen as having a slightly excluding, elitist tone, maybe if people don't feel that they're pretty they might not want to go there for fear of being judged, I'm sure that's not the case at all, but these things do pop into your head on a subconscious level as a customer. I think Perfect Portraits also sounds much more professional, and people do look for quality when making their choice. Best of luck with your business.