Obviously there was something in front of her reflecting lots of light back up into her face.
It appears to me it was just a little too much reflected light there, and it almost borders on going into horror movie lighting. If that reflected light could have been backed off a bit, I think you would have had a much better image. Notice how her chin seems to blend into her upper chest. A little shadow there would have helped make it look more natural IMHO.
Secondly, I think you can crop this down quite a bit. The left arm is chopped anyway, and her left shoulder looks pushed up. Cropping just below her right elbow and about half way across her left shoulder makes her face the cental interest, not the cactus behind her. But again that's just my opinion...
Oops... Can't post an image from Netscape 7.2... Maybe I'll fire up IE and come back.