as a 12 year practitioner of classical Violining (in my youth)...i would have liked to have seen her left hand in this shot. Lot of personality in the left hand position on that instrument.
also, im not sure if this was a particular artistic choice, but I also would have personally liked more DOF on this shot. the violin seems to be in focus, but the girl does not.
perhaps a step or two camera right would have been a better angle for me.