It's basically modeling clay glued to the plastic skull I bought. Honestly, I don't feel comfortable with an écorché when there are so many good ones on the market, starting with the one Loomis suggests in his book (very elegant). Based on my studies of cartoons with Court Jones, where the anatomy is abstract, I made this model to practice rhythm and rendering. It's simply a collection of random features on the skull as the focal point; everything around it is an anatomical suggestion. By the way, the figure in the background (Joni) was made specifically to be used as a reference when making this bust.