Marsh then studied under Kenneth Hayes Miller and George Luks, and chose to do fewer commercial assignments. Miller, who taught at the Art Students League of New York, instructed Marsh on the basics of form and design, and encouraged Marsh to make himself known to the world. He looked at Marsh's early, awkward burlesque sketches and at his more conventional landscape watercolors and said, "These awkward things are your work. These are real. Stick to these things and don't let anyone dissuade you!" By the beginning of the 1930s Marsh began to express himself fully in his art. As late as 1944, Marsh wrote, "I still show him every picture I paint. I am a Miller student."