Hi Katana,
If you look at the properties for the first picture link in your for sale add (right-click and properties) you can see the address link is "http://www.flickr.com/photos/katanauk/105441606" this is the address for your page and not the picture.
To get the link to the picture goto flickr, right click on picture and selct properties, copy picture address and link it in your for sale add...
eg.
http://static.flickr.com/45/10544160...d26407.jpg?v=0
