Hello DSM
I'd echo all the complements! Absolutely stunning!

If you want c and c, the first thing I noticed is the perfection of the little holes in the chin. I assume they are for the outlet of nerves? (foramen? my anatomy is pretty ordinary

). It was the prfection that stood out, that made it look cad. Then I looked at the rest of the model and realised ... it was too perfect! The teeth are straight, the symmetry is ....well.... symmetrical

.
So if you want a c and c, I would suggest dirtying it up, getting rid of the perfect teeth, distorting one side slightly to reflect human foibles.
Or is assymetry skin deep? And are we all perfect inside after all? Just like I tell my missus....
great stuff.
cheers
edit quick reference
http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B7GW4-4NHM6Y7-1&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=410c9b0895d673ddd13993333f2fa998