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OK, so I finally molded the head and created nice castings. Here's how I did it: I cleaned up the original head from the previous photos. I then used Smooth-On's Rebound 25 brushable silicone. I applied a very thin impression coat to get the detail and eliminate most of the air bubbles.

Next, I began building up the silicone thickness by adding a silicone thickener I also got from Smooth-On (Thi-Vex).

Once the silicone was completely cured I applied the mother mold. I used Smooth-On's Plasti-Paste which is a thick polyurethane reinforced with fibers. It goes on like peanut butter and hardens to form a hard plastic that gives plenty of support to the silicone.

Once the mother mold was cured I removed it from the silicone. Next, I carefully peeled off the silicone mold. Before putting the silicone back into the mother mold, I applied a light coating of petroleum jelly to the silicone (on the side that goes against the mother mold). This makes the silicone slide into the mother mold easily and also helps with demolding.

For my first casting I decided to try Smooth-On's "Smooth Cast Roto" which cures in about 10 minutes at a slower rate allowing me to rotocast the piece by hand. Once cured, it is a hard, durable plastic.

Here's the casting right out of the mold....

Here's a picture of the casting next to the master. Next, I will make another casting out of Aqua Resin to attach to the body of "attitude".

Wow, that is so very cool, Bill! Thanks for the update on your work.
I love the reverse-negative look, looking down into the empty mold.
Its so much easier when you don't have worry about if your "model" can breath, isn't it?
I can't wait to see your finished piece! Best wishes with it. ~ Joe