excellent use of depth of field keeping it nice and shallow. skin tones look good. i'd like to see more of her other arm, but that's minor. perhaps a little more light around her face.
only thing is with a 50mm lens, although it's categorized as a "normal" or "standard" lens, you still have to watch out for distortion. you will notice it more when shooting people at a close distance than with anything else. you want to shoot as straight-on as possible. not at an angle that's too high or too low. a 50mm lens is great for getting head-to-toe shots... but for tighter shots i'd go with an 85mm.