Help pulling a User Custom Field

I have created a new user field called picture but am having trouble referencing it. I’m using the following code to generate that page:

function rca_list_authors() {

	$authors = wp_list_authors(array(
    'orderby'       => 'post_count', 
    'order'         => 'DESC', 
    'number'        => null,
    'optioncount'   => true, 
    'exclude_admin' => false, 
    'show_fullname' => true,
    'hide_empty'    => true,
    'echo'          => true,
    'style'         => 'list',
    'html'          => true
	)
);
	
$list = '';
 
if($authors) :

		$list .= '<div class="author-list">';

foreach($authors as $author) :
 
	$list .= '<div class="author">';
 
		$archive_url = get_author_posts_url($author->ID);
		$archive_photo = get_avatar($author->ID, 120);
 
		$list .= '<p>'  . $archive_photo . '</p>';

		$list .= get_wp_user_avatar($author->ID, '120');
		$list .= '<a href="'. $archive_url . '">' . $author->display_name . '</a>';
		$list .= '<p class="author-bio>' . get_user_meta($author->ID, 'description', true) . '</p>';
		$list .= '<p class="author-archive"><a href="'. $archive_url . '" title="' . __('View all posts by ', 'pippin') . $author->display_name . '">' . __('View author\'s posts', 'pippin') . '</a></p>';
		$list .= '<p>'  . $author->optioncount . '</p>';	
	$list .= '</div>';
 
endforeach;
	$list .= '</div>';		
 
endif;
 
return $list;

}

add_shortcode('rca_authors', 'rca_list_authors');

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