gistfile1.txt

$args = array(
  'post_type' => 'attachment', 
  'post_mime_type' =>'image', 
  'post_status' => 'inherit', 
  'my_custom_taxonomy' => 'example-tax-child'
);

$query_images = new WP_Query( $args );
$images = array();

foreach ( $query_images->posts as $image ) {
  $images[] = wp_get_attachment_url( $image->ID );
}