DERPHERPDERP! I'm not a professional but I can give some guidelines for those who are begginners of drawing, to point out a few important things about cats.
So your cats don't look like dogs, squirrels or elephants. :B

Also people forget that there are many types of cats, tons of animals share similar tails ,ears, eyes and they're not 'copyright to only one certain species'.

I have been planning to do these for a few animals I know rather well, cats, bunnies, foxes :'3 Maybe I have to research hedgehogs for Plus1's sake hahah