I like Ron's rendition, although I think it still looks like a hog skull, which seems to be a sticking point with the the guys over there. Last I heard, anyway.
Here's a very simple one...
It's just the above one without the flaming skull. By avoiding the outline of the skull, it minimizes distortion from the shape of the plane, which is really the whole obstacle to making a human skull look human.
If I ever finish this model kit, I can try some 3d experiments. Be kinda nice if I knew when the official end date of the contest was so I knew how much time I had to fool with it. Anybody hear talk of a deadline?