Looking really good!  Definitely don't forget to add the teeth.    Other than that, the only two things I would suggest is making the end of his nose less pointy.  And maybe flatten and widen his skull a bit.  The side and angled views look great, but for some reason it looks very tall/domed and thin in the face-front shot.

"You don't know what we can see
Why don't you tell your dreams to me
Fantasy will set you free." - Steppenwolf