Mouth Molds, Part 1

I thought my pots could use some mouths in addition to all these eyes.  I've been wondering what other recognizable body parts I could make as molds.

These are toothy, monstrous mouths:

This one is modeled on Patricia Quinn's lips in The Rocky Horror Picture Show.  It came out backwards and I couldn't figure how to make it look like the teeth were erotically biting the lips.  Also, there is too much space between the teeth and lips.  I've already made a second attempt at this one.