this sculpt and most of the other little faces are made in hard wax. It's a much easier medium to use for this kind of stuff. You can sand it to a clean finish and carve into it with heated metal tools. You can also add wax back by dripping it to the surface. At first it sounds strange, but it's really a lot of fun, and much easier than Sculpey in some cases. I have a wax 'tutorial' in my journal if you're interested to look deeper.
Thanks for the high praise, I appreciate it,