I participated in a quick painting recently. The artists were told without notice a choice of two places and then they had to paint, frame, and have the art on the walls of the display in a total of an hour and a half. I have taken classes by some great teachers. Some students walk away from workshops expecting to leap into painting like the teacher. You may not feel like you benefited from the class til years later. This experience proved it. Along with years of subjecting my work to critiques, sometimes brutal; I learned a lot from the experience. I sat down and put this together, using lessons learned from those great teachers.
Next is adding depth of color:
Repetition of Design: