Here are a few critiques:
The lines could be a bit smaller and the fluffy stuff near the head/face could be a little neater. The ears could use some work, and the eyes are really pretty, but the expression in kind of awkward. It doesn't look serious or mad or angry or happy . . .it just is. Usually in non-realistic cats, you can use whatever expression you want. I can see that the lines are a bit .. jerky, if you know what I mean. Try making them smoother.
That's about about all the stuff I can come up with. Now for complements to even things out-
It's really good, especially for your first non colored in Oekaki. The shading and the coloring is great too,especially since you jut got used to layering and such. Try to focus more on anatomy, and other then that, this is great! Especially since you use a mouse pad. If you practice enough, I'm sure you could be an intermediate artist.
Sad songs make me depressed