I used a mix of Stan's and Marco Bucci's method for drawing the mouth in this lesson.

I drew 100 Mouths. This was hard. Teeth are weird. I need to learn how to shade and render forms better. Lip textures are labyrinthian. I struggled throughout. Still; worth the practice, especially with some angles and expressions. Consistency evades me. Anyways. Oh, and tongues are aliens that live in our mouths and for some reason we aren't constantly freaking out about that.