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It turned out pretty cool, but for now, this kind of thing might only be suitable for art house maps.
Not exactly for art house maps. First of all, it's about variety. Ordinary screenshots, in my opinion, don't fulfill this function. When you launch a game, it doesn't have a screenshot from the game as its icon, but a specially designed one. I think these artworks play that role. The problem is that it's difficult to create a suitable picture, and you have to put in the effort, but sometimes there are real gems. I personally really liked the red crystal and the hero's path.