This is a good, calm, pleasing composition. But for the shadow on the right. The photoreceptors of the retina vary from the center to the peripheral edge. Basically, cones at the center to rods at the edge. Those at the edge, coupled with the brain, are very sensitive to motion, and tend to draw attention away from the center. Unless the photographer wants this effect - increasing tension - edges are best kept neutral or framed. -Tao of Photography