It's a nice shot and there isn't a thing technically wrong with it beyond it needs a slight sharpen?
DJW put his finger on what's wrong with it and it's not you, it's the model, she looks self conscious and slightly embarrassed, and no doubt she isn't a professional model, so it's quite understandable, but this is one of those 'In yer face' shots that needs a full on brass neck approach. One of Arkady's girls would know how to do it .
Why do pretty girls insist on having these studs anyway??? Dont tell me, I think I know.