Oh go easy, it's his first event.
Next time macho, you might want to look at some other events and borrow elements of there format.
Like, sadly, most people probably wont be enticed by a picture for 1st place, or any of the other prizes.
Also, you have a very specific replay set to win, one that could be done multiple way, neither one really being better or worse as long as the scores match up. While its not good to be too vauge, you want to give people enough room to breath in their entries, to be creative I mean.
Also, typically the mod specified should have some reason behind it. Like, why soccer?
Lastly, you have to make sure to cover any holes, like slycooper pointed out, by your rules people could steal, hack, or do whatever to get the replay to meet the rules. Also there is no entry limit, so people could, in theory, enter as many times as they like. That might seem ok, until you have to go through and watch every single replay a number of times.
You have good ambitions :P but this contest has a lot of holes in it. Im just giving advice though, so don't take this hard or anything.