Most of the critters here are inspired by the fiction of H.P. Lovecraft. The one exception is the beta-version Burrabb in the upper left corner. This was when I was just drawing them as sort of devil apes.
In the upper left is an attempt at drawing a serpent person. It’s somewhat modeled on the Dinosauroid, the intelligent evolved dinosaur prototype that got a lot of ink in the nineties.
In the middle left is a human on his way to becoming a ghoul.
In the middle left is a human on his way to becoming a deep one.
At the bottom is a Mi-Go, one of the Fungai from Yuggoth.