Very true! As an indication that a simple illusration can be a pleasure to do, here is a Penske 7300 Series damper - the chance to draw small items quite large and get the airbrush out. This was done the same size as a car or engine cutaway, as the original was destined to me framed and hung in the Penske Shocks emporium, along with it's partner, posted earlier. It meant the knurling and surface finish could be done in some detail.
Interesting, since the first piece I ever did with an airbrush was an adjustable street shock absorber. Did it as my project for the second half of a little 8-week adult school class, the first half of which was spent blowing bubbles with my Iwata airbrush. The shock was a trial just to see how to do this stuff. It would not be something that I would show, but it showed me a little control over the color, which I tended to lay on too heavily, and various things. It ended up looking OK, but I threw it away after we finished the class. I ended up with another piece about 6 weeks later of a dry sump, multistage oil pump that came out pretty well, considering I had never done another piece in color prior to that.