you captured the essence of a swirling vortex effect which is nice. lighting spacing and composition are all excellent. you also have a good grasp for getting the fore ground mid ground and back ground in a shot giving it depth and form. thats my critique anyway.
No, you know what? Lesogard should roll a whole bunch of different colored balls down the stairs at once... then take a picture of that! Although I doubt those Vatican people will let him. They're probably all persnickety.