Topic on User talk:SmileyB
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Siting the rules here.
Finally (and most importantly, according to our lawyers), the licensing/copyright information for the site where you got the image. This one is "optional" (sort of; you're going to need the licensing information later), not because we're willing to take the fall for you if legal issues raise their hoary heads, but because some sites make it all but impossible to actually find this information. If you can't find it, don't sweat it. But please make the effort. If you're copying the image from Wikipedia, Wikimedia, or DeviantArt, the license information is usually right on the image page, and you can easily copy it.