Hey this looks cool. Just spent some time working on an edit to see if you can't gain anything from my boredom =].
The edit is a bit weird when it comes to her hair because i felt like playing around with the greens. You can take it in a different direction, of course. The main thing to note is your color choice. A lot of times, less is more (I think this one is only 10 colors =D). Take more time to choose colors:
1. Contrast is a big deal here. It allows the character's features to pop a bit more.
2. Try to pick colors that are not following a clear gradient. This sort of color choice makes your pixel art appear flat and uninteresting.
3. Saturation is a good thing, but try to desaturate darks. I.e. I made the lighter tones brighter and more vibrant than the darker ones.
Good luck!