If you do eventually travel the Sculpey road, then I strongly would suggest using the 2 lb. box (if you're buying it in your local craft shops) of terra cotta or white Sculpey. Not Super Sculpey or Promat from the art shop or Polyform Corp.... you get more for the money, and it's not going to be seen anyway; I'm assuming the details of face and clothing, ec. are going to be created from some other sculpting media.
If you use the terra cotta color, be careful, as it does come off and stain slightly. It's also useful for groundwork, trees and branches that may lay on the surface... without wasting the more expensive stuff.