3 things (I'll be direct):
- the chin is not AA-ed like the rest is (also the violet vest on the sides, but that will be really hard to get, maybe it would need to change the slant of the external lines to straight)
- the contrast is low, it can be a stile issue, to keep the piece "dolly" or it can be due to the fact that
- you are pixellig on a white background, which heavily tricks your eyes and gives you a wrong perception of contrast and colors, try editing this piece on a neutral BG, like the color of this forum (color that was not choosen random by the maker of this website which are all very good and expert graphicians and pixel artits). Also when you start a piece use this or another similar (intermediate saturation and light) color as a BG, doing this will save your time.
P.S.: you left 4 white pixels from your BG that's the base of last point of critique.
P.P.S.: O.T.: is graphicians an english word? or should it be graphicists?
good work, keep going
