Helena
As a fellow graphic artist I can understand your wanting advice on airbrushes, trust me the 2 air brushes are all youl need, also dont skimp with the compressor, the quality and volume of air you need is important for good artwork. lots of cheap compressors around and they are not all the same as some may tell you, buy a decent one now and you won't need to change when your airbrush skills improve or add more airbrushes to your arsenal. Practice panels are good to get your skills up with but flat panels will only give you so much skill test, as you improve on a flat panel then start on tanks and round surfaces as these give you a better feel for layout and design considerations. If I am painting good paintwork then I will usually use either a 1500 paper or a red scotch pad to skuff the surface as you need a key to ensure good adhesion of the airbrush paints, then for me it is off to the body shop to get the clearcoat put back on hence why I am learning to paint and clearcoat my own work as the body shop sometimes has a bit of a waiting time, so makes sense for me to be able to do it for myself. I am virtually there with it but it is taking a fair amount of sanding and buffing for my work to look good. I havent the luxury of a booth but have a home made job at the moment for bike tins. I always use the booth of a bodyshop who contracts me for there artwork. Although if it is small jobs like bike tins I use my own little den to airbrush the work, good luck with your practice Helena and if you need any suppliers for the airbrushes I have lots of contacts to supply you. Don't deal with Iwata direct as you will pay through the nose for them.