It’s not a proper MediaRSS feed, so you won’t be able to have Xibo download the image for you etc.
If the “Link” node in the XML contained a full URL to the image then it would be possible just using [Link|image] to extract the photo. Unfortunately it only contains a relative URL.
What you can do is have the Player load the image direct from Bing each time, bypassing the CMS, which will be less reliable.
To do so, you’d override the template, click on “Source” to bring up the raw HTML editor, and enter the following: