And from the department of begging-to-be-made-into-a-watercolor-comic are lush scenes of illicit smuggling submarines in tropical locales.
Or maybe you’d prefer some inspirational reference images from a bleak and cold place full of rusting ship hulks and abandoned industrial shipyards?
Of course, to complete your collection, you have to have underwater shipwrecks and a VW Beetle sitting serenely on the ocean floor.
Then you can add some more cool buildings and interiors to your collection, too. The first three seem like they would be easier to draw believably than the others, but I have faith in your artistic talents.