Right-click or tap-and-hold on the larger image and choose Save Image… Save it to your Desktop. That will make it easier to find.
If you explore a site for another image, make sure to download the most detailed copy of the design to get the best printout.
If a picture is not only for personal use, ensure that the owner's license permits how you plan to use it. I'm not responsible for the content of any of the sites listed. Take the usual caution when browsing random websites.