First,spary some white paint. cover the eyes with tapes,and spray the skin's colour. take off the tapes, and draw the eyes Using tapes cover the face. Spary the eye ball. take off tapes.and repair the left eye.
http://www.youtube.com/watch?v=X1hh8j5meO0 The material they used are not clay. It's flour.So,it also can be eaten- -b...But because flour is more soft,so it maybe more difficult to modeling the model.
This is the material using to make the figure in the video,called ポリパテ in japanese.I searched it in English called Poly putty. It's a kind of sticky liquid. And mix with the harder in the tube.It soon becoming harder.Similar with milliput.