I gave this a 7, but I would have come back and bumped it higher if I had had time to finish voting. I just love the way she breaks up the severe geometry of the shot. Even though she is small and facing away, her impact on the picture is huge. I love such contradictions.
Kidding aside, I think the lines here are pretty neat. Your horizon is a bit off but so is everyone's, so I won't take points for that. The 'model' here confuses me a bit, and the more I look the more I see that without her the picture would be a lot more boring. Nice simple shot, like a lines shot should be.