Hi James
Overall I like this portrait. I like her fresh, natural look. Her pose goes well with the blowing hair. The contrast between her clean, almost innocent image and the graffiti works fine. The composition is interesting but the white part of the wall grabs too much attention. This would be fine for editorial or advertising use, but it looks distracting to me in a portrait. It wouldn´t hurt to clone out some of those strings of hair on her face.