Can I be perfectly honest? it looks IMO to be a question of 'here, hold this guitar to cover your naughty bits!' it is blatantly obvious that she hasn't a clue what to do with it and so despite holding it she looks completely disconnected from it. She has long nails (guitarists do not have long nails on the left hand!) and she is clutching rather than naturally holding it. Finally, I have never seen anyone playing the guitar in the nude and this in itself says 'I'm only holding it for this photo'.
I think the focusing is very good, nice and sharp and clear. The lighting is fairly even though she is a bit flat but that is mostly because she has a clearly very light complexion as well as having fair hair.
So technically it is fine but compositionally, pose-wise, it doesn't really 'hang together' as Skip would say
Hope that isn't too harsh, just doesn't really work for me, sorry.
Cheers,
Rob