This is a very dark portrait, I like the stark contrast between her potential beauty and the deep scars. She seems very angry- shown in her eyes and facial expression, yet her posture is semi- relaxed showing that she is holding herself back. The lower scar is not yet fully healed and she is that angry, maybe she was abused, and now she seeks revenge- hence the horns. The wings seem to me a chance of redemption if she changes her mind, and heart. Her dress is simple like a nightgown, she may have been trying to sleep when she was cut by a lover.
Oohh.. Bwahaha, she looks delightfully evil. I really like the symmetrical nature of this piece - it looks far from "duplicate layer & flip horizontal", which I see a lot in straight-on headshots. (I'm guilty of that, too). The colors and the hair give it a really dynamic look that roughen up the symmetry. Good job!