This picture is double matted. The outer mat is white and the inner mat is black. The dark blues in the sky are actually purple in real life - I’m not sure why the camera isn’t getting the purple. Each painting is an original and you are selecting the actual one you will be receiving. This painting is rectangular, even if my photograph doesn’t make it look that way. Some of the mat may have been cropped from the picture. Exterior dimensions are 14" x 11". Cut-out for the painting is 9.5" x 7.5". Finished dimensions depend on the size of the frame you purchase for it.