I am with Foxflower, embelishing the SBS would be good to add to the quilt. I like the layout as well. It has some great visual interest and watching the flow around the quilt with the pinwheels. If you have time, would add a little flower or something like that above the two SBS in the center. Would add a touch of pizzaz there so not left so blank unless you have some special quilting that will fill it in.