This painting is double matted. The outer mat is a medium sage green and the inner mat is a darker green. The blues in the sky are actually purple in real life. 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. The painting is in a standard size mat. Exterior dimensions are 16" x 20". Cut-out for the painting is 13.5" x 10.5". Finished dimensions depend on the size of the frame you purchase for it.