Great idea, But I have a small comment if your going to consider photo contest, people will vote to their friends and family and it will move from photography competition to family and friends competition and results will be similar to the one Qatar Airways got. If was a disaster competition since all the good images was forgotten and images with lots of technical mistakes got the award.

It will be great if you can use pro photographers from Flickr or other sources in order to seek the real experience in photography. After all we just want to feel the competition spirit