Pentri vs farbi
I noticed in this course, that you use "pentri" as a verb for painting things like walls or rooms. I always thought that "farbi" was used to paint things of only one color, like a wall or a room, and that "pentri" was used to paint artistic things like portraits and paintings.
I have to concur with this. I double-checked the definitions in PIV, and "pentri" means "to create an image with paint" and "farbi" means "to color with paint." You could sneer at modern paintings where the canvas is painted a single uniform color by calling the artist a "farbisto."