Ambientshade, the head in that one cycles image is the Lee-Perry Smith 3d scan model done by infinite realities/triple gangers. There's working links for downloading the open source model here (including .ztl) at the bottom of the page

http://www.jonasavrin.com/2011/01/15/free-3d-ir-head-scan-release-smart-hdr-ibl-vray-2-0/

I couldn't find the BB Firefly renders of the Perry scan head nor could I find the head that Teyon is rendering (personal sculpt?) but I didn't look very hard as I'm not super interested in hyper-realist head models.

I did come across this funny thread though, the more things change the more they stay the same. :)

http://www.renderosity.com/mod/forumpro/?thread_id=2771491&page_number=7#msg3456082

Actually, the head in my render is a different head. It's by the same folks but it's a completely different scan that was used in a skin rendering tutorial for Modo. It comes with the head and something like 8 texture maps, of which I only used two. Also that odd ghostly fire piece was my experiment with the volume node. Hey, I never claimed I knew anything about shading. I'm a sculptor, darn it! :D