I see merit raining on this art contest 
Maybe I'll do something like that nearer to the end, though designing a voting system to prevent manipulation is difficult.
Weighted voting might be helpful, but make sure weight measurement is private.
Small suggestion @theymos, it would be good to create a poll picking the top ten or twenty art works by 22 November 2019 and post it for voting. Through this even the community users can help in choosing the right winner. One who gets the increased number of votes can be rewarded as the winner of the contest.
Maybe I'll do something like that nearer to the end, though designing a voting system to prevent manipulation is difficult.
Weighted voting might be helpful, but make sure weight measurement is private.