This will still be a light and shadow design, but in high key. The light and shadow paintings I have done up to this point have been the full range of values (1-10). High key will keep the values not quite so dark with a range of value from 1-6 with a few punches of 7.
We have also been studying dynamic symmetry (DS) as a design tool. I have included the sketch of my DS grid on tracing paper. My painting is 12 x 18, so I took a piece of tracing paper the same size and drew my grid. Then I placed my items on the grid, moving the still life items as necessary. The idea that DS will help you have a more pleasing composition (similar to the golden mean).
Sorry about the quality of the photos, I was using my cell phone camera in the dark.