but it’s a bit light.

My interpretation is that Blake depicts his subject as a beast-like man, leonine with his flowing beard. His body is muscular like a comic-book werewolf, his beard is so long it drags on the ground, his nails have achieved claw-like length. However, his face is contorted with misery, fear and confusion. He is a beast at bay. He is a symbol of power brought down, the mighty fallen. Down but still dangerous. Perhaps he is in hell.