There is a lovely site airbrush tutor.com where the lovely Mitch gives loads of help to those of us who want to learn the craft. One of the things he does is provide exercises to do to get your skill level up. The following pic is my first attempt at one of those.
Yes, you are right, that is not a cat. It's an eye.
This is the cat.
So that's as far as I have got in 10 days. Again the mistakes are more obvious when a photo is taken and I get some distance. However, I'm not going to shoot myself over them, I'll get better!