Originally posted by dom93hatch
It's simple.
Outline all the shapes with the pen tool, fill and stoke.
If you hold ctrl while on the pen tool, you can control the bezier curves of the path.
that'll only get you an outline of the shape of the car.. to get something that looks more like a cell-shaded object you'd probably play with the brightness/contrast and levels.. the original picture probably can't be very distorted or too flashy, either. not really sure without trying it out first, tho, and i'm at work so i can't...