I like this image. I think you definitely stepped out of the box in finding a unique subject for the challenge. Unfortunately it didn't pay off too well in the challenge. :\
My impression is that the ball is too centered (or even not enough centered) and too small in the frame to generate the interest you want. I do like the texture that the mosaic generates in your background, but there's just something missing from the image. Maybe it's a story...or a general direction. When I look at it, my eyes aren't directed anywhere. In fact, the arms of Jesus tend to draw my eyes out the top of the image. I think a harder look at the subject would generate a more compelling image.
No this is not the work of Devorah Sperber. i took the picture at the museum. I took one at the grand opening and thought it would be good here but I guess not.
where red is the main colour? is red the main colour? gold yellow says more to me, dislike the pattern on teh last supper print is it on fabric? need to be closer in on the glass ball to show me more of that with a little backgorund to give the reversal afect