Acadia,

One image had: "Keyword-->XXXX" printed right on the image. It was on the front page.
Another had a "Special" link, and then when you got to the special image, you had to follow the instructions to click a few times, and the image refreshed, and the image showed a character holding up a piece of paper with that person's keywords.
Also, some of the images actually had characters wearing the coat, so that was kind of a tip off. And finally some images had the Dark Division logo on them.

It was definitely not easy at all. But once I started getting a few words, I could see a sentence forming and that helped to look for the other words.