Bill: Good work! only criticism is that the left eye is a bit off but you can get over that easily.

SlashSeven: It's more than just a sketch or i dunno something about sketches. And hey, it looks really nice, and neat. Proportions - is the most frequent problem of all fanarts. I think that's a only thing you should work on(i mean, including shapes turned somehow in three dimensions and positioning of body parts and details relatively to other body parts and details).
BTW, great shading and so clean lines! I love such good pictures drawn only by pencil and, thank you for that one.

Sashimi: Yes, nice indeed!

vsauce4: GOD THE SHADING IS BEAUTIFUL

APayne1776: This is pretty cool

APayne1776: Wish I had art skills like this

Kori: Thanks

Kori: :))

Zargothrax: I have to agree with the others, this is some nice shading!
Also, well drawn cloak of grey tomorrow, and a plus for how nicely the drawing fades out at the bottom, instead of just "cutting off" at some point.
The only advice I'd give, is to pay attention to how the anatomy of a cat's nose really is. It's symmetric, if you draw a line down, from the tip of the nose along the surface, when it touches the mouth it touches the middle of the mouth. Because of how a cat's head/mouth/nose is shaped, there is a "notch" to the mouth, unlike with humans. You captured that well, but the centre of the "notch", and thus the mouth is off centre.