I'm sorry, Always, I didn't mean to sound harsh
The operative words are "you" -- it has to be a site that you own, pay for, have acquired, not someone else's picture and site that you're borrowing without them knowing. "
You must have the image. . . " not, "someone must have the image" or "an image must be. . ." That's why the example is of your own Web site, not of just any Web site. But, it doesn't have to be an actual personal Web site it can be a photo site too, like photobucket. But it can't be someone else's site who doesn't know about you. That literally, despite what anyone says, is illegal and is theft.
While it's possible and often done, and being the Web one is likely to get away with it with no consequences, it does not make for good character building :-) When one buys Website hosting one has to pay for "bandwidth" which is how often your site is accessed and looked at; Super Bowl advertisers pay more for their sites than the dry cleaner down the street because they're gonna have a gazillion people looking at it all at once and the server has to be ready for that (which is separate from how much "space" your site takes up; could be tiny, one-page but having a gazillion people looking all at once is like everyone flushing their toilets during the ads so they don't miss the game; water usage goes up). When you put someone else's picture on another site, it's still referring to that person's site since it has that URL and everytime someone looks at the picture here, that person gets docked for it there. Instead of people just looking at the picture there, all of us are looking at the picture here at the "same" time. Usage can go way up. Pictures are much larger than words and thus more "expensive" too (part of why DocJohn doesn't have us upload pictures "here" probably) and take up space, etc. The size of the Website has to be paid for in addition to usage and you're getting a "free" large picture hosted by someone else. I won't go into copyright and how it's not a picture you took. . . :-)