The issue I have with this game is that if the tag is "your bike by a lake" and I take my photo on the way home, shower, eat dinner, go to the computer and see that that tag is 2 tags ago, my effort is wasted. I would rather have the tag last a week so anyone can post their own photo for the current tag. Perhaps the OP can choose their favourite photo, PMs the owner of the photo and that person can choose the tag for the next week, who chooses their favourite photo, PMs the owner, who posts a new tag, etc.
OR...
maybe I just don't understand the game.