Aside from all this rigging crazeness I'd like to point you to some information which you might find useful (or not).
http://johnkstuff.blogspot.com/2007/06/ ... html#links
Have a look at his first example (there's a small link to the movie file under the image section) where he deals with a turning realistic cartoon head.
John Kricfalusi always offers interesting examples and deep analysis, but be careful about his optinions. In any case, he's worth a concentrated reading. You don't get more animation advice on this high level for less money.
Head turns from another angle
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