Verusca is obviously a dab hand at airbrushing on cakes as the following pictures can testify. Did I mention, Verusca is a special guest at the Cakeriffic show in August (sorry couldn't resist the plug!).
You can do one of these cars in classes with Verusca and here's a "pictorial tutorial" from her Deviant Art site:
This isn't the same as taking a class of course - the tips you pick up in a class are invaluable (and not just tips from the teacher - the other students often have good ideas and tips to share). If you have the time, income and desire, I reckon classes are a great way to get you started.
Hmm this could be a topic for another day...