These are really good! I really like the first guy; he reminds me of the aliens from the movie Fire in the Sky. The glossy, empty, black eyes really look great.
The second guy is also really cool looking but it seems like his teeth and mouth are more bark than bite; with the size of teeth that he has it doesn't look like he can open up his mouth far enough to really bite down on anything. Maybe it's just that his lack of length in the neck gives me the feeling that his jaw has nowhere to go but back into his throat. Still looks freakin' awesome though!
Game Art and Design student
Art Institute of California/San Francisco