What is your statistics module?
Here is a bare bone code that you can use
awaiting validation:
$sql = "SELECT COUNT(*) as temp_images
FROM ".IMAGES_TEMP_TABLE;
$row = $site_db->query_firstrow($sql);
$site_template->register_vars("awaiting_validation_num", $row['temp_images']); //register template tag {awaiting_validation_num}
media directory size (this will make a huge impact on your server performance)
$media_dir_size = format_file_size(get_dir_size(MEDIA_PATH));
$site_template->register_vars("media_dir_size", $media_dir_size); //register template tag {media_dir_size}