I can see what you were trying to do here, and it looks quite cool. However, a few things I'd have liked to see:
Her right cheek (viewer's left) dissapears into the background too much, I'd like to have seen some contrast, almost like the start of her jawline on the right of the photo. A tiny bit more contrast between her cheek and her lips would be great too; but that's starting to turn it into my photo, not yours!
Also, the top of her hair is slightly too overexposed, her hair would look really nice if it had a little more definition.
As long as you like the photo, and it looks like the artistic impression you wanted to give that is great; I know I would have done it slightly differently, but we're different people
She is certainly a beautiful subject though! I hope you got plenty of other pictures of her!
Hope that helps,
Tim