Your photo should be less than 2MB (or 2,000 KB) and in JPG or JPEG format. To help your photos look their best, resize your photos to 640 X 480 pixels before uploading them. This also reduces the time it takes to upload your photo. It will be resized to for the category and detail pages automatically. It also helps to keep your photo in landscape (wider than tall), rather than portrait (taller than wide), or square.