An art frame includes a three-dimensional supporting frame, which includes an image receiving surface and an opposed back surface, a center portion defining a perimeter, and at least three foldable extensions extending from the perimeter. Each foldable extension includes two folds to be folded toward the back surface to form a frame portion. Abutting frame portions form respective corners of the three-dimensional supporting frame. A corner mount is to be inserted into the abutting frame portions at the respective corners. Each corner mount includes first and second opposed surfaces, a shaped portion, and two corner mount foldable extensions extending from two sides of the shaped portion. Each corner mount foldable extension includes two tabs to be folded toward the first opposed surface. An adhesive layer is established on the second opposed surface and is to be adhered to the back surface of the three-dimensional supporting frame at the respective corners.