Congrats on a new personal best -- which I see you have already surpassed. :D
The lighting on the ceiling provides an uneven background that works very well with this image. With it the puzzle pieces do indeed seem to be floating at different depths.
The main drawback I see is the lack of anything that can be considered the center of attention. The random placement of the pieces may have won you points with the abstract lovers, but at the cost of a subject for the rest of us.
Congratulations on your highest score yet and thanks for choosing my username for the challenge! I agree with one of the commenters below that the puzzle pieces look like they're floating (not 2D), thanks to the background. It's really nice. WTG!