Hi,
There is no built in functionality for that but can make small modification in the plugin file itself.
You can insert author image URL in foreach loop. A raw sample code is as below:
<?php
//Ensure that these line are called before foreach loop
$author = get_the_author_meta( 'display_name', $authordata->ID );
$author_img_url = 'YOUR_IMAGE_URL'; //<img src="..." />
?>
// Search for this line
<?php foreach ( $authors_posts as $authors_post ) { ?>
<li>
<?php
// Add your code
// Don't forget to apply your formatting
echo $author.' '.$author_img_url;
?>
...
