i'd like to start out with some anatomy errors in the eyes, they seem to be placed in a different direction then snout and head are facing, do watch out for that in the sketch stage.
Your painterly technique is really nice, and you seem to be on a great track with understanding shading and fur. you have a nice balance with smooth and feathered strokes in the fur as well. the nose lacks slightly in dimension compared to the attention you gave the other parts of this piece. but that's only a very minor nit pick. ^^
The hair is good, but it looks like its in a competently different style from the cat's main body, creating a detach. The eyes have that same problem. they are all great parts, but together they don't seem unified.
I have to say whats happening in the eyes is beautiful, but, it creates a lot of confusion for the viewer, because she has been placed in a neutral blank background. furthering the detach of the eyes to the figure, because the city scape would cast very different lighting and shadows on her.
You really are a very talented artist, and i hope you didn't take my crit as too harsh, just want to help you improve ^^