Hello Mike,
I am really sorry for the delay of this reply as it is a weekend for us here. I am really sorry but unfortunately that wouldn't be possible currently
You can however, customize the theme file blog.read.navigation.php and add the codes below to get the blog image,
<?php
$previousBlog = EasyBlogHelper::getTable('Blog');
$previousBlog->load($prevLink['id']);
if ($previousBlog->getImage()){
echo "<img src='" . $previousBlog->getImage()->getSource('entry') . "' />";
}
?>
The example above is to retrieve the previous link's image. You can add similar codes for the next link.