Hi, very nice work your doing there, please keep the pic's coming
For the airbrush it really all depends on what you want to pay. But you wont go far wrong with an iwata brush. but these are a bit on the expensive side.
I have used the Neo airbrush a few times and it's a pretty good piece of kit for it's price, a good starter brush.
It is linked to iwata but doesn't come with such a long warranty.
For the compressor again buy the best you can really, preferably with a tank that holds the air, as ones without you can get pulses while it's running. also adding a moisture trap into the airline helps.
Here's a link to some airbrush kit's.....
http://www.airbrushes.com/