I am a Bloodclan cat.

The smile seems a bit.... I can't describe it. It just looks like a human smile shoved on a cat. You need to show that she has that fang-like tooth, etc.
Her nose sticks out a bit too much, smoothen it out a bit and it should look fine.
Her tail looks stringy, as if it were hanging on by a simple thread. Add a little more fluff/flesh/bone to that tail of hers.
Her hind legs seem very thing, and it seems to come just a tiny bit too high into her body.
Same with front, not as bad, but the distant one seems skinny. Also comes up into body too much.
The eye seems too big, too long. Maybe half of the eye would be the perfect size.
The shading seems like she was rolling in black ash or dust. If you were looking for that. I recommend taking the original, and darking it just a tiny bit and shading over.
Background seems awesome, but the floor seems like you drew half bubbles on them c:
Last, the tuft. It seems to be too deep and sticking out for a "Warrior Cat".
Just my opinion, not being a hater or anything :c