Thanks for all the positive feedback!
All I used was a Sideshow Art S. Buck figure. I carved out the face with an exacto and used Sculpey to flesh out the inner mouth and tongue. To get the hair, I removed the hair from a Lon Chaney Vampire and a BTVS Der Kinderstod figure (didn't have the patience to look for fake hair). I used a matte varnish on the skin parts and a high gloss varnish on the bloody parts.