Brian Tindall released a book about articulating the face, its full of great insight from a Pixar veteran
You might remember Brian from his amazingly helpful site http://hippydrome.com which goes into great detail about topology, joint placement and articulation. If not you might recognize some of his work.
Hippydrome's Character and Articulation Demo Reel 2012. This video is ©Disney/Pixar from HippyDrome on Vimeo.
If his book on the face is half as informative as the information that is freely available on his site, it will be well worth the price of admission.
http://blogs.indiewire.com/animationscoop/ebook-review-the-art-of-moving-points
https://itunes.apple.com/us/book/the-art-of-moving-points/id639498241?mt=11
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(rant: how many of us have ipads? i'm guessing not that many)