Here's a question do you think it's safe using Audible's images?
I think it's a bad idea in general to hot link an image to a publisher's server, which is what copying the URL does.
Their webserver can track any webpage that uses it.
And some, like Graphic Audio, will then give you a different image entirely.
I don't post much here, but I just copy the image to a free image host and use their link.
There are many of these, e.g.:
http://ultraimg.com/
http://lookpic.com/
http://imgur.com/
Some you can paste in the Amazon or whatever URL and it will fetch and mirror it.
Or just copy to your desktop temporarily and upload to the imagehost.