I fixed the lighting problem that plagued my last two renderings and the result is probably one of my favorite mandalas yet (my favorite is still the Ballwin mandala). I was able to fix the lighting issue by pulling the light source farther away from the imagery and then making the light source brighter. The result is more diffusion of the light without the center being bleached out. If you look at the rendering details below, you can see the the center of the rendering is the Ellipse and without realizing it, I made an circle out of the Ellipse :-)
rendering details:
: detail on a seam :