I'm not the biggest fan of the glowing hair or all of the crap in the background, or the dark shirt and dark background blending together.
Next time I'd try higher with the hair light (and probably turned down some). Do you have any more reflectors? You could try to throw some light on the outside of her arm to separate her from the dark background. Next time get her to straighten her ring too (I miss crap like that all the time when shooting).
Don't get me wrong, your picture's not bad, I am just picky.