Famous triangles

[Gors]

the sprite still looks bad because of the lack of care in the outlines, such as hair.

also the brush eyes and mouth totally clashes with the rest of the piece, not to say that you should avoid dithering and use solid colors instead.

ps: that's not the way you shade a triangle; since the triangle is a 2D object, it shouldn't have curved shading or any shading to that matter.