Liza is shy about her pretty smile.You'd think such an attractive girl would be a natural in front of the camera, but Liza is a little nervous--not so much about taking off her clothes but about showing us that metal-mouth smile. "I try not to show my braces if I can," she said. We assured her that braces are appreciated around here, and soon she was comfortable showing us her tinsel teeth. "It's kind of funny that I don't have any problems taking off my clothes, but showing my smile makes me self-conscious. I was going to wait till I got my braces taken out to try modeling, but I got over it and took the plunge."What made you want to model?"It seemed like it would be fun. I like to show off my body, and I like the idea of guys looking at me. I'm always the first one to want to take off my top at a pool party, and I always walk around naked in locker rooms. My phone is full of naked pics too."Have you ever taken photos of yourself having sex?"Yes. I've even…