Exactly. As a great idea this is, it must be organized in order for it to fully function the way you would want it to, without having 5 art scenes from 1 person, 2 profiles pictures from another, or 1 large and 1 small cover for another 4 people, you know? It’s ultimately up to know and the amount of time you want to do both keeping up with your story and free art. But once again, it’s not a bad idea at all (: Good luck with it though. Fill free to reach out if you need advice too!
(Like Ash sort of said, you could also do contests? That’s even more limits too)