To offer some constructive criticism, as this is my honest opinion. The foreground leaves are too in-focus to really pull the composition off, I think. If the foreground and background were more out of focus, basically just boke, then I think the composition would work. But with the foreground leaves out of focus, but still obviously leaves, they are actually quite distracting. My eyes keep bouncing between the leaves and the model.
Absolutely beautiful girl. Great portrait! I tend to agree with jrista about the leaves. I probably would have shot this the same way however and then later come to jrista's conclusion. So I'm glad he made the comment. Good info to have in the back of my head so I can forget it later and then wish I'd remembered it. Pre-emptive D'Oh!