The following are potentially useful art links that I have come across or have been recommended:

Art Organizations and Associations:

Ottawa Area

Council for the Arts in Ottawa
Figureworks
Manotick Art Association
Ottawa Art Association
Ottawa Watercolour Society
Sandy Hill Life Drawing Workshop
West Carleton Arts Society

Other Associations

Canadian Institute of Portrait Artists
Drawing Society of Canada
East Central Ontario Artists Association
Portrait Society of Canada
Society of Canadian Artists
The Pastel Artists of Ontario

Art Galleries

Local OttAwa Galleries

National Gallery of Canada
Ottawa City Hall Art Gallery
Ottawa School of Art Gallery
The Ottawa Art Gallery

Online Art Galleries and Resources

ArtCyclopedia
Art Renewal Center
Colored Pencil Society of America
Essential Vermeer
Museum Syndicate
Olga's Gallery
Smithsonian American Art Museum
A Stroke of Genius
The Royal Collection