You can see by the inset samples, this is essentially a layered contoured drawing with multiple shapes stacked up. It's very similar to my method of airbrushing with frisket masks - layer, upon layer.
Indy Pace Car
In 1979, the Ford Mustang was selected to pace the field for the second time since the car's debut. The 1979 Mustang Pace Car was available as a V8 or turbocharged four cylinder. This illustration is 100% hand drawn in Adobe Illustrator, and is all vector based.