The Doctor warned Romana not to move when he spotted the artist sketching her. When he told her she was being sketched, she quickly looked and knocked over a bottle. The artist, frustrated, stood up and threw down his pencil. He tore and crumpled the sketch, then threw it on the floor and left.
Due to the time experiments, this event happened a second time, including Romana knocking over the bottle and the artist crumpling the sketch. (TV: City of Death)