Using a piece of rough gator board with marble dust/gesso mixture set a whole different tone for a painting about light. After weeks of smooth surfaces and glazing I decided to "shake it up." I used transparent watercolor with lots of mark action on top in the shadow grass and more opaque thick color in the light. I wanted big shapes...with interest. Checking your work in the b&w mode is a good way to see how successful/unsuccessful you were.