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.
My dad worked at Gatwick Airport as a cleaner in the 70s when he was a teenager. His first week there, a woman drops a duty free bag with a bottle of booze in it and he rushes over to clean it up. He’s just about to put the bag, full of liquid booze and broken glass, in the bin when one of the senior porters stops him and tells him to bring it in the back. Turns out they had a filtration system in the break room for this exact scenario. They’d pour the booze out of the plastic bag and through a sieve that would collect all the broken glass, it would all go into a big container at the bottom and voila, free booze! They offered my dad some, but he declined. Anyway, I guess if you were working at Gatwick in the 70s you could have had a chance to drink some airport jungle juice, you’d just need to be brave enough.