I'm trying to think of what this reminds me of, so while it's escaping me, we'll just skip over that thought. lol
The different tones used for her eyes actually work really well. After looking at it the first time they seemed quite distracting, but I don't think so now, they add to keeping your eyes (lol) on the piece that little bit longer.
The lines are so fluid and smooth, it gives the piece a nice amount of movement! I kinda see the whispy lines in front of her face to almost be like the background you have on your page - like what the wind would look like if we could actually see it.
Wouldn't mind seeing a second version of this with a very little amount of colour added in, too! =D