Kim's photograph is noteworthy, and not just because he is the only one who doesn't look under duress. As the Associated Press reports, it's pretty unusual to see a photograph of Kim that has clearly not been digitally altered.
(Somewhat ironically, North Korea's love of Photoshop is reciprocated by Photoshoppers' love of North Korea. Kim has become a regular guest in PhotoshopBattles, a subreddit devoted to digitally altering images in humorous ways. For some fun, take a look here, here, here and here.)
Speaking to the Associated Press, some experts wondered whether the lack of editing was an intentional message. Chang Yong Seok, a North Korea expert at Seoul National University, suggested it was to make North Korea seem like a "normal country" that isn't so different from its peers.
This wasn't the only surprise contained in the mugshots, however. Ri Yong Gil, chief of the Korean People’s Army [KPA] general staff, was rumored to have been executed for corruption in February, but he's also featured quite clearly among the new headshots. According to other reports in the North Korean press, he isn't just alive but thriving. He apparently has three new titles: Member of the party’s Central Committee, alternate member of the committee’s powerful Political Bureau, and member of the party’s Central Military Commission.
You can see the other, non-Kim headshots below (Ri is the last photo).