[Linked Image from worldatlas.com]
It works for me.

I believe you have to insert the url of just a picture only (run a quote on this post and you will see the picture link just ends in .jpg) without any framing or host info.

If you open the link from the quote, you will see only the picture. Compare that with what you get from opening the links inside the [brackets] above.

"Live like you'll die tomorrow, but manage your grass like you'll live forever."
-S. M. Stirling
[Linked Image from i.pinimg.com]