A roughly hashed out concept with some quick colors to see if I liked them. I didn't even bother to erase the pencil before coloring.
The idea is that there's a type of warlockish people who delve into the occult, and learn how to willingly let demons possess them, but still keep enough control of their bodies to use the demons more as tools for a job. When they let this happen, they take on the physical traits of the demons inhabiting them, so they change shape. So the person on the left is their normal appearance, and the one on the right would be the same person possessed.
It should be fun the play with the idea more when I get the time. I'm always up for drawing monsters.