Very interesting take on the challenge. Refreshing to say the very least. You definately did this with a creative approach.
Composition isn't bad although I would love to have seen some of the faces of the onlookers it would have added a bit more drama to see especially the faces of the kids.
The colors here seem to be very good but the focus is a little soft in spots. There is a texture though visable in the bricks as you can see them well.
Overall it is a very interesting photo and gives you a lot to think about when you look at it as a whole and think about it...Don't just look and pass it by.
The image seems a little out of focus and/or oversharpened. Solarization is visible along the cuffs of the trousers (mime). IMO, a tighter crop eliminationg all but the mime and his case would make a powerful image, particularly since there is ample available space to have him play to none but an emptiness.
Despite this, and because of the 'magic' captured here, this photo remains my choice for blue ribbon. The fact, that the suitcase is left half cut off, is very apt and welcome here. It does tell us enough to know what is there, without including anything that isn't essential to accomplish this.
This could have been a good subject but I think your angle on it doesn't really capture it. I think it would have worked a lot better if you'd taken it from the front, perhaps zooming in so all you saw were his hands framing his face. It's a nice clear picture though.
At first glance this seemed very much like a snapshot. I get the whole mime looking out of his invisible glass wall structure so it met the challenge, but still seemed like a snapshot. Then as I was scrolling down to get a better view my browser cut out the people on the top and just left the mime and the negative space of cobblestone and it had much more of an impact. It still was a candid, but him holding up his hands to the negative space just makes it more curious. I think had you cropped out the top your score would have been much better.
Cool interpretation of the challenge. I like the overall framing of the shot, but i think seeing more people on the right would make it feel more balanced for me.