It's funny - I thought this would have finished higher than mine. We kind of had the same idea but I thought your use of the toilet conveyed it better. Goes to show that you never know how a voter is going to react.
With potting soil and more flowers the shot would have been better IMO. I don't know if the venting really help the photograph. Wish you well in the challenge.
Great idea, shame about the lighting and exposure. If this had been brighter and the flowers a bit more in focus it would have been brilliant. Focus seems to be far more on the grass.