You're right about the smiles, nach. Traditionally - and traditional - Koreans don't smile in photos. There's even a superstition that if a woman smiles on her wedding day/ in her photos then her first child will be a girl (not always the prefered choice in the Far East). It's not taken so seriously anymore and South Korea has been invaded by camera phones and cute poses jut like other countries but for older generations, and almost certainly for North Koreans, smiling would be a no-no. They probably havent had many photos taken in their lives either. The looks of terror on their faces on the other hand are most certainly because of *who* they are posing with. :)