Multiple images in an RSS feed item

Question

I'm trying to add an RSS feed to my friend's image blog. His blog is just images with rarely any text, and I'd like to include multiple images in each RSS feed item but it doesn't seem to be working. Can anyone clue me in to what I might be doing wrong?

The staging URL of the RSS feed is here: https://determined-varahamihira-c09ae2.netlify.com/blog-rss-feed.xml

<?xml version="1.0" encoding="UTF-8" ?>
<rss version="2.0" xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:media="http://search.yahoo.com/mrss/">

<channel>
<title>Scott Rankin</title>
<link>http://scottrank.in/blog.html</link>
<description>Scott Rankin's Image Blog</description>

    <item xmlns:content="http://purl.org/rss/1.0/modules/content/" xmlns:media="http://search.yahoo.com/mrss/">
        <title>Will Boone</title>
        <link>http://scottrank.in/blog.html</link>
        <content:encoded><![CDATA[
            <a href="http://www.andrearosengallery.com/artists/will-boone" target="_blank">andrearosengallery.com</a>
        ]]></content:encoded>
        <media:content type="image/jpeg" width="600" height="844" url="img/blog/will-boone/wb_01.jpg"></media:content>
        <media:content type="image/jpeg" width="600" height="844" url="img/blog/will-boone/wb_02.jpg"></media:content>
        <media:content type="image/jpeg" width="600" height="844" url="img/blog/will-boone/wb_03.jpg"></media:content>
        <media:content type="image/jpeg" width="600" height="844" url="img/blog/will-boone/wb_04.jpg"></media:content>
        <pubDate>Nov 13 2018</pubDate>
    </item>

</channel>

</rss>