I am a big fan of your work. And I am not an artist. At all.
The Lost Soul looks great. They don't have tongues or a split jaw but it looks great.
The Baron's second horn isn't appearing behind Doom Guy's leg.
The Revenant's arm is behind Doom Guy's left leg, but the Revenant's right leg is in front of the orange pile in front of DG. This makes the Revenant look very short.
The shotgun is noticeably curved. I find that weapons need to be very straight otherwise they look weak. Especially guns since you need a straight barrel to shoot bullets/shells. The trigger is a bit small. Otherwise the shotgun is very impressive and very accurate to the new game.