Love the colors!
Don't know what kind of batting you used and how far apart you can quilt. Are the pinwheels tied thru the centers of all layers, or is the ribbon just for embellishment? If your batting allows it, I would go with less quilting in the pinwheel blocks. If it's not tied, just stitch in the ditch tip to tip to stablize the block then a swirl or two coming off the tips of the pinwheels at an angle.