That's a really nice picture.
I would try lifting the position of the camera slightly so she is looking up at you, that will open the eyes and give a more sensual look. Actually, maybe just get her to lower her chin slightly to get the same effect (would also be more flattering by hiding the underside of the chin, always a tricky spot with women) as if you raise the camera too far you might reveal a bit too much.
I reckon the end result would be a killer - in fact you might not want to post it on here afterwards!