Okay. First the one that doesn't need a reference, basically the colors. Stick to FE7 or 8 colors because mixing them together can create an unattractive result. The outline around the head is FE8's outline. If you go with that outline, make the rest of the colors FE8 (which includes changing the skin color as well). Also, there needs to be some more shading under the headband. Anyway, the rest of the stuff isn't as simple for me to point out. Here is a very large(!) picture for easy reference (I'll use the one on the right since the difference between the two seems to be only skintones):
Red box: Fir's ponytail is visible. Erase all of it.
Orange box: Missing an outline.
Blue box: Small green dots outside of the lines.
Purple box: Ears are a different color from the rest of the skin (make sure to stick to one). It is also too close to the eye, so move it to the right a bit.
Pink boxes: Small shading fixes.
Yellow box: A very dark green color here that is not present in the rest of the hair.
Of course this is only what I noticed. . . so there may be some other things I missed. Hope it helps at least a little bit.
Also, not sure if you know about the easy way to recolor or not is. Here is a link to a video tutorial another member of SF made since I have a hard time explaining it: http://serenesforest.net/forums/index.php?showtopic=23568