If you are uploading a digital photo, it must be at least 300 DPI or approximately 1500px * 1500px (or higher). Size of the photo can usually be found under the properties of a picture file.
The actual print size (dimensions) of the photo must be at least the same size of the print area. It can be larger, we will adjust the size if necessary. The print size cannot be smaller then print area, otherwise the file will break up and loses it's sharpness.