The entire piece lacks contrast - You should make the shadows darker, and add more texture to it - make the outline a bit jaggy to represent fur. I also didn't realise those were the cat's paws until a few seconds. You also need to define a clearer light source - it's the only way you'll portray form effectively.

Also, instead of making a plain black outline, you could make a darker outline of the color of the object you're doing. Makes the outline less shocking.

Oki but i liked to keep black contour.
I would arrange that.