Looking good

It would be even better if we could get alt title and url to use it like this

$image = Categories_Multiple_Images::get_image( 102, null,horizontal_thumbnail' );
foreach($image as $img) :
     echo '<li><a href="?"><img src="' . $img . '" title="?" /></li>';
endforeach;

https://wordpress.org/plugins/categories-multiple-images/