Nice sprite you made there, bonofthedead!
You said you like her fists, but for the sake of the whole, you must "kill your darlings". The fist position didn't make any sense to me and the stance looked very instable. I tried to adress these things in my edit. I think your stance is okay, but gives a different statement. It's up to you what you prefere.
Colorwise, your selection was very dull imho. I tried to choose more appealing (to me) colors. The red/orange shirt gives a nice contrast with the green pants (nice detail on the knee btw) and the shirt colors can be used to AA the skin colors.
Two other things which buged me were the ears and highlight on the hair. I haven't done any ear studies yet, so mine are mostly nonsense, but I hope I can show a direction where you could go. The hair is mostly manga-style shading, so ignore it if you wish. I tried some different shadings, but this worked the best in the end.
Oh, and it's a girl right? So I tried to hightlight her breasts, hips and crotch a bit.
yours - mine:
Keep pushing!