Getting control of my airbrush

maybe you have been wondering what happened to me. Well, I'm ok. I've just been busy with my new airbrush. I have long desired to have one and I could finally buy it.
I spent 3 days trying to understand how it works and now I feel I'm starting to use it in the correct way.
This is an example of the exercises I'm been doing:

I hope I can shortly show something better...