There are far (far far ) better sculptures out there ZoltanMotherwell, ENulmerfigs, VicVeinz and STUDIOGENESIS to name a few. Here is my humble attempt to share the how to with the willing cut the mouth out with dremel filled in negative space with sculpted teeth
bit by bit build up the face hardening the clay as you go ( i used heat gun) Hope this helps the cause!!!!!!!! Cheers mates!!!