Actually, it's quite symmetrical 'cept for the teeth, which are often not all that symmetrical (my aren't ;\) However, this needs a lot of polish. Google image on skull and just gorge upon all the skullness and try to apply it on your own pixelled skull :]
EDIT: Sorry for my bad english. The english language, for me, has become something of a playground where I bend rules as I see fit with the benefit of never having to think. Sorry for the ear- (or eye-)burning, mate.