>>1410022are you using stroke? your lines are much thicker than they should be, after drawing a line make sure to remove that. the lines look better overall without it, above all they will end up sharper which makes hairlines look better. i would maybe add a shadow for the rest of the mouth too, if you cared for any feedback that is.
so still working on my first here, im trying to be as consistent as possible with the lines (thickness) but its been slow going cause of the source image being tough to read. blah.