Starting a still life

The peonies in my garden are at their height, and if I didn't paint them today, I would miss my opportunity for this year. I usually like them when they are in a tight ball, but with the heat and humidity, they were opening very fast. So, I cut a bunch of flowers and set up this still life in my studio. The light comes from a north facing window that starts about 8' off the ground. I put a board behind the set up to give myself a light background. I always stand when I paint, so this is about eye level.