What's important is that you like the photo but just a few things I noticed:
1) You cropped her off at the knee joint which looks a little odd to me.
2) She seems a bit soft (especially the hair and left hand), perhaps your shutter speed wasn't fast enough to freeze the motion?
3) I think the image would be stronger if the background was more blurred (shallow DOF)
4) I also think the image would be stronger if you crop some of the left off to obey more to the rule of thirds.