I think part of it is basing everything off adult human proportions. Like top right has a fat old man face in a cat body, and bottom left has like a buff human body with a cat head.
It’s similar to old paintings of children and babies, where they’ve just done an adult human but smaller, instead of looking at how the proportions of small children are actually completely different.
This made me think of an article I read today about the Nazi occupation of Rome during WWII:
Not exactly the same, but every day it feels like there are more and more echoes of the past.