getcontest cover url

$thumb_params = array(
    'width' => 400,
    'height' => 400,
    'crop' => true,
);

$thumb_params['size_name'] = 'fv-thumb-list-' . $thumb_params['width'] .'x'. $thumb_params['width'] . 'c' . absint($thumb_params['thumb_crop']);


$cover_image_url = $CONTEST->getCoverImageUrl( $thumb_params );