I really like this shot too. The colors and shading of the sky going from bright to darker blue left to right along with the lighting of the grass and the nice rich greens further back all combine to make a pretty shot. I've cloned out the model with my thumb and back and forth a bit while looking at this. The colors and smoothness of the shot seem better without the girl, but when you take her out, the balance just isn't right to me. Maybe if she was wearing something a bit lighter in color perhaps looking off toward the right of the frame, I'd like it better. It's almost as if there is too much contrast between her skin and her dark top - and also between the light grass and her - and that interrupts the otherwise amazing smoothness of the other shading in the photo.
What a stunning image! Not sure about the model though - her body language or the black clothes somehow seem to be fighting the rest of the image. Beautiful ocloring and sharpness. ~ Lonnit