besides itch and occasionally here where are people doing game jams at y'all? (plz do not cross reference this with my previous status lol)
If I need money and want to make money off my art, I would just work for an employer or commission. They tend to pay well enough so I can afford rent, food and still have some money left.
Instead, create something inside the same project. That is unserious, and 'loosely' associated to your main game.