How do i sell paintings with the new pack

Just the title. I was not entirely clear on what i wanted my new business to be yet, so i decided that my BF (Paulo Rocca) was going to sell paintings and i would sell coffee and cupcakes in a little shop. But i am not clear on how to sell the paintings? I figured out that i need to use shelves for the objects that he makes on the woodworking table, but how do i sell the paintings on the wall? I am so frustrated i just left the game and made this post