Lovecraft would be proud. Also I think our ArtWar Champions would be fast friends
I really like that you went with a beak, sets it apart from other Mindflayer type characters. The Chitinous plates are also great, especially the lower-half of his body and the plates on the sides of his head.
Seems really solid man. Hard to point out any flaws from my perspective.
Is his right hand an actual crab? Thats really on-point.
I like that normally we see thing like this as Mindflayers and they are thin and wear robes and are clearly magic users of some kind. But this guy is real bruiser, like he's the General/Commander of all the Eldritch Horrors. Leading the Armies of C'thulu.
I absolutely love your concept! It looks horrifying yet bad ass! His face is awesome, love that little beak and tentacle things.
Only thing I feel is out of place is the design of the wings. They look awesome by themselves but I feel like they don't fit with the character very well as he's pretty much all exoskeleton and sea life while they're made out of bones