Yasushi Nirasawa and Takayuki Takeya
Check out a selection of their detailed models here.
See more models here.
Profiles and additional art by both artists can be found here.
Unpainted examples of Takayuki's models here.
More model pics here.
Here is a decapitated head which fortunately comes with a manual on how to feed it.
Below are photographs of one of their more detailed sculptures.
Below are photos from an insane model that I think is by Takayuki. See more photos of it here.
Takayuki Takeya was one of the creature designers in Takashi Miike's "The Great Yokai War."
This page has some very cool sculptures although I'm not sure who is responsible for them. Some favorites.. 1 - 2 - 3 - 4