[Butz]

I think it's because more detail was put into the body than was put into the head. The head looks too cute and cartoony for the body that it's on. It'd be like taking Mickey Mouse's head and putting it on a Gundam.

//Edit: Another thought is that it could be that we're all used to seeing Graal heads with the chibi-style bodies, so anything else looks immediately wrong to us.

Either way, it's the head's fault.