vBulletin Album's script does not allow arranging, sorting, or re-arranging (for that matter). The only way for any kind of sorting is the order in which you upload the photos to the album. However, there are additional plugins that can be added on (by an administrator with FTP access) that will help improve the functions, search features, and overall display of the album.

But as for now, in short, no way to do so.