Everyone needs money to live and nobody wants to talk about it and how to get it. I have found that anything I do just for money turns out not to sell. If I think, “oh so so will love this and buy it,” I am wrong. To get money you have to not paint for money or write for money or do anything with that sole purpose in mind.
Now marketing what was already painted for love, that is something else. Marketing is just showing someone what you have. That is all. It is not persuading them to buy, or cajoling them or tricking them or even bothering them. THEY are just people who may or may not love what you do. They have to see it though as you want them to see it.
Wear it if it is clothes. hang it in your house if it is a painting. put it in a natural setting and they will love it too. Marketing is a gift. Y0u are sharing your special thing and that is not selfish, or money grubbing or anything else negative. It is sharing your loved thing and that is unselfish and pure. Marketing is pure love if you think of it rightly.