It's probable that the piece shown here is the C13 Bard and was never released as a variant of ADD18, which should have an open mouth. The differences are very slight, less than those between any of those in the Monster packs with multiple variations. see Alan Robertson's discussion on CCM. Whatever the real story, the open mouthed version is extremely rare, so this guy will have to stand in for now!
Sculptor:
Aly Morrison
Painter:
Bodmodels