BatBrain
Super Freak
To me it looks like her head is just too big proportionally to her body. It really sticks out in every picture I've seen of her.
I really don't think it is but maybe that's one of the issues with how she photographs. I think Scarlet Witch looks like she's got a huge melon but I've never seen her in hand so it could be the same deal. As cliche as it sounds, some figures just look so much better and different in hand.