What do you mean by "Big head"? There's only one head size, bodies, eyes, and outfits don't change the size of the character at all, hairstyles may often make the character slightly bigger and some accessories may add some extra to the character but it should always fit a 16x32 cell size.
Edit: By big head I'm guessing you meant hat, correct? if so then I see what you're saying, some hairstyles don't go well together with hats, but I'm afraid if you want it fixed you'll have to edit them yourself as they're not being worked on anymore.