I love the original open-mouth Vanessa and Avantguard sculpts but this doll's mouth borders a little on the Kesenia/Bucky Beaver side. I think it's the shape of the upper lip that creates the buck-toothed effect. The upper lip is too plump and rises up higher than a 'normal' lip. The two upper lip hills (I don't know what else to call them) are too close together creating the appearance that teeth are pushing it out and up.
I will not be keeping the head.