This is pretty awesome. It's like the female version of that Helm portrait
. I like how this piece actually gives off some mood due to the lighting.
Small crits though; the moon looks very jagged, but that's probably a result of the scale lines you have in the sky. And also, under the lips, and to our left, there's some funky lighting going on that you should maybe look at.
Overall, this is nicely done. Great job, keep it up.