if i were you, i might use a slightly darker shade of red, so that the AA would work better, as of now, they both contrast with the black to much.
also, why did you use the red to AA one side of his forhead, and not the other?
despite my few crits, i really like the way you did this piece in general. the soft, desaturated colors just seem to work, and the eyes and nose look really good for such a limited palette.