@Irbis: It's because she's a giant! If I draw her with normal proportions, Zareth just looks like I scaled her up. By making her head roughly the same size as everyone else's, I can use her body proportions to make her look big!
I already like this Zareth guy. The way he is holding that thief like an unruly child totally unbothered by his hurling and boxing is hilarious. But why is his head so small compared to rest of his body?