I have draft, i'll be making specification for the developer starting next week. One more thing i can disclose now, that most probably all contests will have an option to take advantage of "beneficiary" functionality. If you enable it, the prize pool will grow depending on upvote values of pictures uploaded by contest participants.

For example there is 100 participants for some given contest and allegedly all contest entries collect 10 Hive of rewards on each of them. That wold be 1000 Hive from the Hive rewards pool and lets say beneficiary vale is set at 15% so prize pool for that give contest would be 150 Hive. That of course means 15% less hive on your post that enters contest. But you still get increased exposure and rest 85% of your author rewards. But on the other hand you can win the pot :) Thats risk/reward ratio you have to take into consideration before entering the contest. And many more other similar features that i do not want to disclose at this stage :)

If I can help you with anything, just let me know :)
Help is always appreciated:) What's your background if i may ask?