Watermarking your images are the single effective method of protection, at the expense of marring your images. All other methods have various workarounds. Small images (appearing on Details Pages) and Thumbnail images (appearing on QuickView Pages and Index Page) are considered too small in size to warrant protection. Additionally, given that watermarks are the recommended best way of protecting your images, note that any large watermarks would be displayed cropped on images of smaller size, like the ones identified above.