all img from all posts

<?php
                    $query = new WP_Query( array( 'post_type' => 'post', 'posts_per_page' => -1 ) );
                    if( $query->have_posts() ){
                    while($query->have_posts()){
                    $query->the_post();
                    $image_query = new WP_Query( array( 'post_type' => 'attachment',  'post_status' => 'inherit', 'post_mime_type' => 'image', 'posts_per_page' => -1, 'post_parent' => get_the_ID() ) );
                    while( $image_query->have_posts() ) {
                    $image_query->the_post();
                    echo '<dl class="gallery-item"><dt class="gallery-icon"><a rel="shadowbox[sbalbum-1];player=img;" href="' , the_permalink() , '">', wp_get_attachment_image( get_the_ID() ) , '</a></dt></dl>';
                    }
                    }
                    }
                    ?>
                    <?php wp_reset_query(); ?>