I took this from an article,

"Rare Pepes are digital assets in the form of collecting cards. Created by artists and built into the same blockchain as Bitcoin, they're intended to be traded or sold for Pepe Cash, the cryptocurrency for fans of Pepe the Frog. The sector is specialized but alive: At present, over 1,500 different Rare Pepe cards exist. A little more than 600 are listed in the Rare Pepe Directory."
-Sébastien Wesolowski.
So basically insert your art into the blockchain and then people may want to buy it. Same as how an art gallery works in my opinion.