I was watching another contest and I really liked the way he chooses the winner. It's quite transparent and democratic, and I perceive that it makes all the fans happy.
I share it with you, maybe you want to consider it in upcoming contests.

The user made a post in which he uploaded all the images of the participants, (they were more than 90) Yes, it can be a long job. Then he assigned each one a number. People vote in the comments, selecting the number .. Nobody knows who is who, so the choice is simply more genuine.

Greetings.