Screwed up on the legs a bit, oh well. And the tail is too fat on mine...XD
Some pointers:
Cats ears are not that big, and not sharp, they are rounded at the tip.
Shorter muzzle, close to their face.
Cats tails are never straight down like that, almost never.
They have small, delicate paws that aren't big.
Hind legs don't curve down like that on most cats.
Cats fur is usually not perfectly smooth, and have a few bits sticking up here and there.
Mostly they are skinny, but not that skinny, slightly...chubbier.
The other paw doesn't go right out from the neck, it should be closer to the other paw and neck-ish area.
The chest is never smooth, it will indeed have hairs sticking up here and there.
Yeah, thats all I have...XD