This is nice, This is very, very nice. I am a critical person when it somes to photography, but there's not a lot I can say here. You have produced a wonderful photograph of a honestly beautiful girl, well done!
One thing which may be benificial and you may have already noticed but your depth of field is extremely limited and the hair infront of her chin is becoming blurry. This is not a huge problem, but I think for such a gorgeous girl, you need her every aspect in sharp focus. Just closing your perture half a stop will fix this.
Well done - I really do like this photograph - such beauty is rare.