Did you know that each size I offer for prints is a different aspect ratio? I didn't set out to do this, it just happened! This means that the exact shape of your print may look slightly different from the product photograph you see, although I try my best to show examples of each! When I make prints, the image of the original art is altered slightly to fit the paper it will be printed on. Most of the time this is not very noticeable unless you are looking at them side by side.
The graphic above shows the various sizes and how they compare in both ratio and size. As you can see, the 4x6 and the 8x10 sizes are the most different in aspect ratio, and every other size falls somewhere in between.