I've always thought of the sort of minimalist pixel art form you're doing for her as being similar to gesture drawing. When you gesture draw, it is vital to avoid drawing the idea of a thing instead of its reality. The cat you're doing is very stylized and represents the idea of the character more than the reality. It's a big cat. As a result, you've exaggerated proportions to make it read as a big house cat. I went through and played with proportions (though possibly taking out some of your spaghetti length in the process):
(Full disclosure, I'd never actually seen this character before looking it up to see what I could do)
When I studied some reference images some of the proportions that jumped out at me were:
* Its head is only slightly wider than her hips.
* Its paws are the same size as her shoulders.
* Its eyes are as high above its nose as its nose is above the bottom of its jaw.
* Its tail is half the length of its body.
Even this I ultimately didn't really feel conveyed the proportions very well so I did a quick anatomical breakdown using different colors to represent each appendage. I heavily recommend this technique when dealing with any new/unusual anatomy as a way of blocking out forms:
I've changed its pose a little but I hope this stuff helps you find the information you need to correct your initial sketch and I look forward to seeing what you come up with.
Good luck and great work!
