Canadian art close-ups: Emily Carr, Tom Thomson, Paterson Ewen

What makes one beautiful artwork worth more than another? If its by an accomplished, well-known artist, that often makes a difference. Other key factors include rarity, when a work was created (say, during a significant time in the artists life) and whos owned it over the years. Sometimes, a great back story is what elevates an artwork into a must-have for collectors.

As the 2013 Canadian fall season gets underway, CBC News asked three auction house experts to chose an interesting piece up for sale and to share just what makes each one great. Toggle between the different artworks using the tabs below. Hover over each image to zoom in and explore its details.