There are some jagged lines on her feet and hands. Also, at this scale, I think it could really use some anti-aliasing. The 2px outlines look blocky and unfinished without it. AA would also help with the jagged parts.
Actually it is a binary art, not pixel... Kinda not the same, at all.
Anyway, it's cool! Really cool cartoon style. I like this character very much.
Looks cool! Playing around with line width like a piece like this does might make improve it :) http://pixeljoint.com/pixelart/79309.htm