Rocky Horror Lips Mouth Mold #1

As a part of my project to create mouth molds for use as decoration on pots, I've been trying to reproduce the image of Patricia Quinn's iconic lips from The Rocky Horror Picture Show.  In the image I was using as a source, the teeth are biting the upper lip and I'm finding that hard to reproduce in the mold.  Also, the reddish glaze ("Plum") came out a little too opaque and obscured the details of the lips, and the glaze ran into the off-white glaze ("Queens") of the teeth.