Hi there! I'm not here to join, but I have a suggestion for you to increase the prizes(payment).
In my honest opinion, logo makers/designers/artists here prefers higher payment for logo making, though it's a contest, it still matters.
The logo of your brand will be it's identity, that's why your logo desinger or the winner here should be rewarded with better payment for his work.
Who knows if your company will boom after that. Just making suggestion tho. Goodluck