Below is another composition based on the round form. I placed a band of quinacridone burnt orange between the central dark blue and an outer perimeter of turquoise (that I later glazed with the reddish ultramarine blue). I left the paper white for a interval, just right of center and added flatter, unsaturated colors along with a couple more strips of quinacridone burnt orange.

Interrupted Circle
12″x9″ 140# Cold Pressed Watercolor Block

I like the unbalance between the two halves of this study.