Yeah, I think it looks kinda nice. Seems like you got the hang of the technique, basically. The thing is, these look a little too much like old computer ega/vga graphics. The hues of all the colors stray a little too much from the original color I'd say: the hue shifts are too strong. If you make them just a little more like the original colors it might look more realistic. Maybe it's the contrast though.
Also, I don't like that the mouth is only one pixel wide, and black. Maybe make it a little lighter, and use some AA or something. Also, I think the area directly over the eyes is too white. Maybe use a little AA between that area and the eyes.
The picture is nice, but I think that you can mae it nicer.