This appears a little fuzzy and I can imagine that it was difficult to shoot what with the backlighting and trying to place emphasis on the bottles with the movement. It is fascinating to look and definitely interesting and you did a great job, IMO.
Not sure the silhouette helps here. Good idea, but I think you could have put some light on the juggler without compromising the great transparency of the bottles.
Normally I wouldn't like the main subject so dark but for some reason it seems to work well here. Maybe would look even better with a little fill flash, I don't know. Cropping is nice and the clouds are not too busy to distract. I wish the subject was actually looking at the bottles but I've never juggled bottles so maybe you don't actually look at them. Great photo and interpretation of the challenge! 8
I like that the colors of the bottles are the only colors in the picture. For me, though, a complete silhouette of the juggler would have been more effective. Still, a good shot. 6