lovely, espc. the colorchoice
i've got no crits on the portrait - perfection imo
the kneecaps on the fighter looks quite odd though, the bottom shading on the left (her right) knee is too dark, the right knee is too far to the right and is ephasized too much, makes her look a bit butchy and unfeminine. Also, as alex said, the neck - face transition looks a bit off, moving the head a pixel to the right might help but i dunno.
Amazing job though