Huh, I thought their maws were on their torsos.
Also, the beard around the mouth, there... err, yeah, looks like my nightmares tonight will have a... feminine touch. Ahem.
That's the plan, yeah.
IIRC, the maw started at the base of the jaw (merging with the actual mouth) and ran down the center of the upper body. The majority of the maw looked to be on the torso, so that's where my version has it, but there's a lot of variation between depictions.