Primarily known for her impressionistic oils, Margo Petterson's trademark has always been her “Feminine West” series, depicting the women of the early west. She has also become known in recent years for her equine art, focusing mainly on the American Quarter Horse and Draft Horses.

Her paintings have been shown at the Cattlemen's Western Art Show in Paso Robles, California; the C.M. Russell Art Auction in Great Falls, Montana; Draft Horse Classic in Grass Valley, California; Montana Miniatures, Great Falls, Montana.

Petterson's work can be seen in Spirits in the Wind Gallery, Golden, Colorado. Her work has been published in Art of the American West, Directional Publishing Company, and Inspirations Unlimited, to name a few.

Membership in professional organizations include Signature Member of the American Academy of Equine Art.