You can buy a Web Size image, roughly 640×480 pixels in size, or 0.3 megapixels. This is suitable for web sharing on social sites like Facebook. Or you can buy a 1Mpix image, roughly 1 megapixel in size. These photos are for your personal, and not commercial use (Read Personal License). The 1 Mpix download is roughly 816×1224 pixels, about big enough to print an 8×12.
And we want to help with your commercial application. We're proud of our lion photo in Afar Magazine. It remains the Most Popular Photo on EarthPhotos.com, as voted by users. A couple of weeks back, we placed a photo on a kids' show for German TV. All these commercial applications are different, so please talk with us about what you need.