More Gorillas...

Spent some more time last night sketching gorillas.. Found a website that had a crap load of pics of different animals with their mouths open. Yawning and screaming and such.. it was neat.. But it became quickly aparent that I have no idea how to describe the inner workings of a great gaping maw... As you can see in the drawings.. But I need the practice... And it'll only get better.... right????