Watson was a prolific muralist whose work can be found in major corporate headquarters, universities, churches and hospitals. His Province of Ontario, 1967, a brightly coloured mosaic mural commissioned by the Government of Ontario for the MacDonald Block at Queen's Park, Toronto, uses a variety of traditional and contemporary symbols in a modern decorative style. It represents the history of Ontario's European settlement, natural resources and products, and includes stylized crosses of Saint George, Saint Andrew and Saint Patrick and the flag carried by Samuel de Champlain.
In St. Lawrence Town, Watson reminds of us of our strong French Canadian Catholic roots—a school or other institution on the crest of the hill overlooking the town with a duo of nuns in long black capes with white flowing habits making their way along the road. A train sits on the rail, ready to take freight or people to the next populated town.
Watson was active in Toronto art circles and became an elected member of several art societies including: the Canadian Society of Painters in Water Colour in 1942, and the Ontario Society of Artists (OSA) in 1947, where he served as President from 1952–1954. In 1954 he joined the Canadian Group of Painters, and in the same year was elected to the Royal Canadian Academy, as well as the National Industrial Design Council in 1955. He exhibited widely and his work can be found the many important public collections including: the Agnes Etherington Art Centre, Queen's University at Kingston; the McMichael Canadian Art Collection; the Robert McLaughlin Gallery; the Canadian War Museum; the National Gallery of Canada and Hart House, University of Toronto.
