Check out a sample of such below.
Here's a sketch of some art I put on a tank panel for a Harley as an experiment waay back in the late 80's. I wood burned the image then airbrushed it with leather dye. Wish I had the panel itself, I may, but haven't seen it for some time and since we just moved a few months ago it could be buried or lost forever. Sigh.
A little sketch of Ol' Frankie taking his daily stroll around the castle. He really is a gentle soul. At least until the townfolk come a runnin' with torches and gardening instruments.