Besides what cristo has mentioned, this isn't JUST a contest on "artistic" merit. You could have the most gorgeous photo, but if it doesn't quite resonate with someone with regards to the intent of the theme, it should not win the contest. Borek's picture is not lacking at all in the "curiosity" factor and has as much of a claim to win this contest as the other pictures.
I will also remind you that this contest is done for fun. If you start taking this way too seriously and resort to belittling member's entries, then I would suggest that you stop participating in it completely.