Comic Theories for Games
If you’re not familiar with Aaron Diaz, he’s the guy who makes Dresden Codak. There, now you know who he is. Everybody knows Dresden Codak, right?
Even better (I’m sure saying that will get me in all sorts of trouble), he’s written some really wonderful essays (posts? tumblrs? articles?) on various aspects of comic visuals that can very easily be applied to concept art, character and environment design, and even level design to some degree.