gistfile1.txt

$params = array ( 
    'meta_key'  =>  'review_image_value',
    'orderby'   =>  'meta_value_num',
    'order'     =>  'DESC' 
);

$query = new WP_Query( $params );

while ( $query->have_posts() ) :
  $query->the_post();
  echo '<li>' . get_the_title() . '</li>';
endwhile;