I've never really done a redline before, so I suppose it kind of shows. So far, I've only done the head.
Overall, I think you did a very good job. You have the overall parts of the cat down, but the size of the body parts are a little off.
-Your head is very well shaped, but the ears are just a little off. Try making them a little larger and just a smidgen back.
-The neck starts a little too up front.
-The legs a a little too narrow. Try looking at real cats over the internet to get a feel for how big or small to make something. It helps a lot.
-He's a little too long.
(I'll add more as I go along. You did very well. Cats are hard, but they get easier the more you draw them.)