This is a VERY rare crit with pixel work, but I think there's too much contrast! Looks like she has blobs of sunscreen all over rubbery skin! Poke the colors some, try to find a better skin pallete.
Also, another rare criticism, you might want to poke at your clusters some more so they're not as grouped up. It looks excellent at lower Rez but as soon as you blow it up you see how polygonal / abstract painterly she looks