[Stiglr]

About mouths... and other anatomy details.

Do a Google search on "3D modeling human body anatomy". I have found and bookmarked a site that really goes into detail on creating "photorealistic" body forms... very high poly models, but very precise and accurate...

I can't get to my home PC right now, but I can tell you that tutorials on this do exist on the web.

Don't restrict yourself to just AC3D sites.... sites supporting 3D Max (especially), Maya, and all the other high-ticket modeling programs all have a TON of advice and tutorials. Provided you understand the basic concepts of modeling, you'll be able to figure out how to do the same things in this program.