That's the second half of the puzzle. From page 13 of Dewey's book
In this drawing I sketched out the design using an automatic pencil and then used a series of grey and blue Pantone Tria Markers to block in the colour. A black marker for the wheels, grille and lights, and white acrylic paint for the highlights more or less completing the drawing. To finish it off I emphasized the edges using a thin ballpoint pen. If you notice, I didn't worry about keeping the shading within the lines as it was important to get the markers won quickly. Doing this helps keep the paper wet, which aids blending, but also gives the drawing more movement. Once you are familiar with using markers this way, you should be able to get this kind of drawing done fairly quickly.
