No question these are spectacular.
My only critique would be on the first one because the head looks strangely forced on the body. But I don't know what these creatures look like in real life. Seeing the level of perfection of the others my guess is it's right on and maybe just a funny angle.
Tell your friend he is amazing and he should show his work!
"Not conceded, just better than jail" - Dr. Spawk, FPC