::rolls up sleeves::
Ok, constructive critism for Myomoto
First up outlines, sometimes black outlines make some images look good, but in this case, its a skull , black and white and 2 opposite colours and makes it stand out too much.
Id recommend having a reasonably dark grey, than a little loghter grey to add into all the curves, so they dont appear so jagged.
Teeth are never perfect like this :P And they are far to thin, id recommend making them more, natural.
The rest is real nice, well done ^_^