I'm still new, but: I guess even if you stop people upvoting themselves, their followers will vote for poor content posts, because the followers want to be recognized by the whales. Besides that: it's going to be difficult to filter by content quality. If you filter by many words, you miss good photographers or painters, who don't need many words. If you have some official "guards" to check the content, it's still very subjective. Let's see where the journey leads...