I like it, the composition, tones, and framing. Strikes me as 'cool', in a temperature sense and I can feel the wind..."contemplative" if I had to describe in one word.
Nits: man, you've got one dirty sensor; I think I'd clone out the one grass stalk rising behind the subject.
Agreed on vignetting, or at least tone it down just a little. To me, seems like a melancholy seasons change, coming into fall.
Was this available light? I love the image but her face looks like it's lit a little strangely, and I think softer light would fit the image better.. just my opinion though.