She might just actually have a massive head. I once worked with a woman whose head was WAY out of proportion with the rest of her body. Whenever she got up from her desk, I would watch because I was convinced one day she was just gonna teeter over due to her massively oversized head compared to her body. I used to think she was pretty until I noticed that disparity and from then on, I was just creeped out. I've never met anyone since who had such a mismatch in head vs body size before or since and it's really stuck with me over the years.

Tiny people appear to have massive heads, because of their small bodies.

It's giving Detective Conan