How to get all attachment image from post ?? WordPress

<?php

/*
* Template Name: Gallery Page
*/

$query_images_args = array(
    'post_type'      => 'attachment',
    'post_mime_type' => 'image',
    'post_status'    => 'inherit',
    'posts_per_page' => - 1,
);

$query_images = new WP_Query( $query_images_args );

?>
<?php get_header();?>
<div class="main">
    <div class="row">
        <?php foreach ( $query_images->posts as $image ) {?>
            <div class="col-md-3">
                <img src="<?php echo wp_get_attachment_url($image->ID); ?>" >
<a href="<?php echo wp_get_attachment_url($image->ID); ?>" download>Download</a>
            </div>
        <?php }?>

    </div>
</div>
<?php get_footer();?>