ETA: A direct link is a link to the picture not the page the picture is on. Like if you put your link into the url bar it would take you to the flickr website and have the picture on that page but if you type mine in it takes you directly to a page with just the picture on it, no flickr shite.
Got what I am saying? You need to right click on the picture and select " copy image location" and use that link. Not just copying the URL of the flickr page that has your picture on it. I know this sounds confusing, but I am a bit out of it and can't think of a better way to explain it.