So the face turned out a bid cartoony, and Ill fix that, but my advice to you is to study cats anatomy and USE CIRCLES, or squares, and just sketch over and over and over. ^^ I suck at drawing legs and thats why this took me so long, but I just like to point out that there are different breeds and different breeds have different anatomy so just focus on one breed and practice! Always mix it up and try new things after youve got the basics down.
Edit I also kinda drew this at a smaller perspective then your cat, if you could blow my picture up a bit it would work just the same
Please note that when I did this I didnt know as much as I THOUGHT I new about anatomy since, then Ive learned alot, the back legs I drew are terrible. Sorry!