You need to copy and paste the ".jpg" code and not just the link to the page where the picture can be found.
http://www.flickr.com/photos/yagablue/6769220057/http://www.flickr.com/photos/yagablue/6769220057/ by http://www.flickr.com/people/yagablue/, on Flickr
In Flickr, click on SHARE, then GRAB the HTML.BBCODE, then check the BBCODE. Copy and page the code that shows in the box.