Ms. Turpentine

She arrives on the street, having gotten word of a budding Grouch artist in the area. It turns out to be baby Gabi, who has made a simple, crayon, line drawing that Oscar considers the grouchiest piece of art he's ever seen. Turpentine concurs and offers Maria several cans of mud and bags of trash for it. Maria refuses to part with it and Ms. Turpentine leaves to scout more talent from the local day care center. She returns soon after to see Oscar's artwork, an exact duplicate of Gabi's drawing. She won't accept it, however. Oscar crumples up his work in defeat, making it the much more valuable piece and they start the negotiations.