What you get is fine, it’s the image id, now you just need to loop them and output the structure that you want, for example.
if (!empty($images = get_comment_meta( $comment->comment_ID , 'reviews-images', true ))) {
foreach ($images as $image_id) {
$image_src = wp_get_attachment_image_src($image_id, 'full');
// Now you have the image src, $image_src, you can do what ever you want here
}
}