Beautiful shot! Great lighting (direction), vibrant but not over-done colors, great detail in the shadows, well balanced composition.
I don't quite like the aperture though: The background seems neither sharp, nor blurred; I would've preferred a stronger statement in that regard: Either make the background almost sharp like in a landscape shot, or blur it even more to give the photograph a more portrait feeling. But perhaps that wasn't possible under the conditions and I certainly wouldn't have sacrificed the great quality of this shot for a bit more artistic flair. So, in conclusion, Bravo!
Sheez these comments, give some credit for the amazing photo and not just the pretty model. . .
But really, this picture has nice atmosphere. . . I like how the model is part of the shadow and the lighting lights up her hair and the background. Beautifully taken picture ! The only thing that actually bothers me, is that her face is a bit "cloudy" if you know what I mean.