While subscribing to e.g. http://www.bing.com/HPImageArchive.aspx?format=rss&idx=0&n=1&mkt=en-US (the official RSS feed for daily Bing images) You will notice that the image (linked in the RSS feed) will not be shown due to the item link and img part are having only relative URLs, like:
<link>
/th?id=OHR.GBRTurtle_EN-US9472992921_1920x1080.jpg&rf=LaDigue_1920x1080.jpg&pid=hp
</link>
<pubDate>Wed, 16 Jun 2021 00:00:00 G6T</pubDate>
<description>
<img height="280" src="/th?id=OHR.GBRTurtle_EN-US9472992921_1920x1080.jpg&rf=LaDigue_1920x1080.jpg&pid=hp" usemap="#map1" border="0"/><map name="map1"></map>
</description>
Can this be solved somehow?