Media Mail is reserved for MEDIA --- books (that you read), newspapers, etc. A photo album is definitely NOT included.
In the event that you do send it media mail to save a couple of dollars, keep a few things in mind: Media mail can take 2 to 3 weeks to arrive to its destination, the USPS CAN (and sometimes does) open media mail packages to inspect to ensure the contents are, in fact, media items. If it is determined that you violated the media mail rule, they will either return the package to you for the correct postage OR they will deliver it postage due to the recipient.
Either way, it's NOT a good idea. Just pay the correct postage and call it a day.