Oh this is a great image! Love the pose and the composition. The tones are wonderful. The effect you've achieved is awesome, this photo just oozes drama! To me, it has the look/feel of a charcoal drawing. Lovely, just lovely! :-)
Great shot- the hair placement, the trees, the sky, and the effect is really nice. I would try one of these but stare right through the camera. This doesn't need improvement but it might be interesting.