First off, it looks good. In this forum you can click a picture to make it larger, by the way, no need for pre-zoom.
Okay, the face lacks defining features beyond her eyes. This is mainly evident when you zoom it in. I recommend you add a mouth, use a dark skin shade if you do.
Next, you have too many colors, you could probably have the same result with maybe half that color, so you definitely need to work on color conservation.