I'd like to note two things:
A. The reflection is cool, but it doesn't add to the picture and with it, the subject is too centered (as I'm sure an experienced photographer like you has realized), therefore I suggest cropping most of it.
B. The hand is in an awkward position, the basic rule of posing is that any hand above the waistline must be pointing up, ergo the wrist should be bringing the hand closer to the top of the arm not the bottom - I really don't think I explained that well so If you didn't understand ask and I'll try to explain it again...