When I drew this I was working out anatomy type stuff where jaw structure is concerned. Namely, a snake's lower jaw isn't one piece. The left and right sides are connected at the chin by a ligament or somesuch that lets the sides stretch apart a fair bit. If anyone was wondering why I keep drawing here with that odd bit of line down her chin and lower lip, this is the reason. That's skin that's sort of bunched up when her jaw is closed and relaxed.

Naturally, she can also unhinge her jaw, just like any snake.

At this point, I'm undecided whether to make the tip of her tongue forked or not.