Stacy has very nice features and I like the black hair flowing all the way down to the shoes. I think next time you should give her a background that isn't dying away (or hand her a flower!), although the look of nature color does work.
Not bad, although for a best of, this doesn't really seem a likely choice... Is there a story here I'm missing out on? Overall a fairly good image technically, it just seems to lack real impact and there's a bit of distraction with all the branches and such. She does have a wonderful look on her face though.