For the side view, nothing but Photoshop; pen paths, gradient fills, dodge and burn, cloning, paint brush. I used some pieces of the concept.
The 3D was Google Sketchup freeware, the model available for free at the Google Sketchup Warehouse. There is no rendering output, so I cleaned up a screen capture using the methods described above. A great love for cars, formal art training and 17 years of Photoshop experience also helped a little.
