I've been following Paul Budzik's Youtube air brushing lessons. If you haven't seen them they are worth watching, especially for someone with less experience like myself.
This was the last in the series, but a great example of his lessons.
https://www.youtube.com/watch?v=p2QPqwDV2ys&feature=em-subs_digest
Bill L.
The Paul Budzick videos are very good. Definitely worth a watch or two.
Regards,
Lee G.