hmm...air brush is a magic tool (if u can use it well) using it u can create anything u want however u ned to know how to use it well, im chopping for half a year by now and i almost never use airbruch cos: 1) i hate it (not realy realistic) 2) im not particulary (sp?) great in it.
there is no actualy a tutorial on how to air brush, u gotta find someone who is ood in it and ask for tips most people have their own style of air brushing. Concerning CF u should try out diffrent techniques (
www.photoshopjunkie.com www.photoshopchop.com www.digimods.co.uk and etc.)