Nice photo, cute girl, but I wish she wasn't wearing that lipstick. It's all wrong for her. Perhaps a soft red or something with an earthy tint would work better.
Photos where most is b&w and the lips are colored are very hard to pull off. I've only seen one such picture on here. Usually it just kind of gives off a clown look which is what i think happened here. I think this one would look much better without the purple lips. Other than that i like the shot.