List all images from a single post meta value

You should reorganize the way you store the images: Make the uploaded files children of that particular post, do not put them in a post meta field. Then get all the images with get_children(). Look at the built-in handler for the shortcode for some examples.

I should go like this:

$args = array( 
   'post_mime_type' => 'image',
   'numberposts'    => -1,
   'post_parent'    => get_the_ID(),
   'post_type'      => 'attachment' 
);

$attached_images = get_children( $args );

foreach ( $attached_images as $image )
{
    // print image
}

And even if you want to stay with post meta fields, do not store URLs, use the attachment IDs instead. URLs can change any time (think about a migration from dev to production site).