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You usually link pictures by typing the link in square brackets [] and then again in normal brackets (). The square brackets is what you will see in the post later. If that's the picture url, it will show the picture, if it's normal text it will show a Hyperlink. If it's empty you won't see it at all in the thread. However, since the Boards overview takes a picture from the first link in the thread, it will use the picture regardless. Or, without over-analyzing it: [] (link) [new link] (new link) will show the link-picture in the overview, and the new link-picture in the thread

Gitonmahlvl