In fact, the vow includes the salvation to countless all beings in the past, present and future. Such great vow. If you have Ksitigarbha Sutra, I suggest you recite it every day, and you'll understand that.
Talking about the link to those images, there's one I like very much, of which the Bodhisattva was standing on a rock with hell fire surrounding Him. I think this is a very great image indeed. You can download it and put it as your desktop wallpaper.
