Unflavored, unsweetened gelatin powder.
Hand mixer (with only one beater)
skin colored acrylic paint
flesh tone makeup
Step 1: Sculpting
Step 2: Casting
Allow your plaster to dry thoroughly, when the surface is cool to the touch, you'll know it's done. Carefully remove the plaster from the clay, you might destroy your clay original in the process, but were done with that now any way. If any bits of clay are stuck in the mold, run a little bit of warm water in it to soften it up, and use a metal pick (paper clip would suffice) to get the bits of clay out.