ACEOs are Art Cards, Editions and Originals. Other terms include Art Cards and Artist Trading Cards.
All Art cards are 2.5 x 3.5 inches in size, and as ACEO suggests, they can be either original works of art or editions (usually limited), of reproductions of original works.
Painting miniatures is as equally challenging as painting larger canvases. The challenges may be different, and the techniques may be different, but each still needs the thought and skill.
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