I love this watercolor tutorial using a scene from Mad Max: Fury Road as the subject. Well-known artist/illustrator Scott C. (Scott Campbell) shows you how he uses reference shots from the film, does some preliminary sketches, composites the scene based on those sketches, and then, casually step-by-step, how he went about painting up the final piece.
It’s kind of refreshing how this is not a completely rote set of instructions. It’s conversational and Scott’s not afraid to admit his mistakes and say when he doesn’t know why he’s doing something.
I’ve only dabbled in watercolors, but I’m tempted to try this. It would certainly be fun to spend some time studying those war rigs and trying to render them.