OP: Faces and Mouths

So as you know I'm working on a OnePiece fan manga. If you didn't well now you do.
I decided I needed to know more about the specific style of one piece. But i'll just incorporate the style with my own a little.

Now the Faces of One Piece are a little hard to grasp at times. Especially since the mouths practically control the face. The head's structure is simple angled lines that meet up at a curve at the bottom. I normally draw narrow faces but in one piece the faces are wide, to accommodate the big mouths. The profile is quite simple but once again it'll be easier knowing how the mouth is going to be before drawing the head. Now the mouths literally have no limit whatsoever. GO CRAZY with em!! Neither the rear upper row or rear bottom row of teeth ever show at the same time. There are exceptions but rarely.

See eyes and noses here: [link]