I agree that this is a fascinating and amusing shot. What's most pleasantly surprising is that, despite the wild motion, the face is tack-sharp. Well done!
Good headshot, though you probably shouldn't lop off the edge of his ear.
The lighting of the overall scene is intriguing, but the model needs some spotlight on her.
Not a keeper:
Legs and guitar and the silhouette of the back of a head don't quite cut it. It would be especially useless in a model's portfolio.