Regarding points 2 and 3, check out Artists&Clients [1] – it's exactly what you're suggesting, and I (founder/dev) commission greeting cards on it myself :) [1

Regarding points 2 and 3, check out Artists&Clients [1] – it's exactly what you're suggesting, and I (founder/dev) commission greeting cards on it myself :) [1]: https://artistsnclients.com https://artistsnclients.com