Nomad
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Selling digital art is profitable because you can sell the same art again and again, and you can not only sell it as an art (poster, canvas print, wall hanging) but also use as a product photo on clothes, bags, baps, et. There are many platforms for selling digital art. Fine Art America is the largest online marketplaces. Other options include Etsy, Redbubble, Zazzle, Society6 etc.