Wow, that's definitely small
I really like this, the overall form; it's very well defined for such a small sprite.
I hope you don't mind people doing edits, 'cause I did a small one:
The only thing I really changed here was the palette, upping the contrast and tweaking the colours just a bit. At such a small scale, low contrast can really blow the details.
I managed to reduce the colour count, too. There were quite a few skintones that I couldn't see being used, even at 8x zoom. I also used some the colours from the dress elsewhere (like in the skin, and I think on some of the aa on the hair).
Think that's about all I got. I'm not used to working in such a small space. Like I said, it's looking good, so keep at it