A hideous wax baby face I made for one of my illustrations. The book describes an enormous wall monster morphing and stretching out of the plaster until it looks like plastic. I though wax was a nice transient material that resembled plastic but would behave in a way suitable for my needs. I have a couple of plaster casts of some freaky doll heads lying around so I made a quick shoddy mould with one. It didn't matter if the head was a bit wonky or lumpy. Monsters aren't perfect, it makes them boring otherwise.