Hello. This is how you get paintings. First, You walk or drive to the museum. Then, there will be random paintings on the walls. After that, go to the desired one, and click the info box, there will be an info box that pops up on your screen. If you want to frame it, there is a box which you can check that allows you to frame the painting. After, press the "Purchase" button, the painting will then be taken off the wall, and be transported into t=your inventory. And whenever or wherever you want, you can hang it on a wall in your house!