I love Kitty's outfit in this picture. Her blue-green headband almost matches her eyes, if not entirely. That throw-on jacket brings out her awesome white turtleneck. Also, this is the first time I seen her wear regular blue jeans instead of her usual black pair. The boots are really cute, perfect for winter, and a welcome change from her usual white high-heels.
I like how you added a shadow for her tail. I appreciate the effort with giving her big eyes. I also like how you accentuate her cat ears. Her hair looks awesome, even though it looks like she just got out of bed.