Blair,
You've got nothing to worry about or shy from. Just show the interiors, you will increase sales. And get more products with that Ferrari red paint job, or even a cobalt blue paint job. Short of that, you'll have to do what I do with my work, see gallery below. Of course my photography sucks, so if *I* was really in the business of selling amps/preamps I would hire a photographer.
Working on a differential EL34 design as I write, now, back to work...
Anand.