These guys amaze me and I've been fascinated by Car Art since I was a child. I will tell you that all are not or claiming to be "profesionals" most of the time, alot of the work is done quick for a contest.
I implore any of you to stop in and play, even if you simply trace smething and color it in, which is how I started and now do it in Photoshop, It's still art.
I hope that sooner or later we can expand on some things with genuine car fan tutorials on simple cutting out images with different tools and so on all the way to coloring and airbrushing to creating wheels at angles or perfect circles, Line art frames for say a dragster to street rod in many different programs reasonably available to all.
I had a tough time voting on one myself.