Shawn Hill knows two things: comics and art history. Somehow that led to him writing the Harvey Kurtzman entry for Icons of the American Comic Book: from Captain America to Wonder Woman (2013). He also writes art criticism and is a member of the International Association of Art Critics (AICA), an NGO of UNESCO.
How did they know how to be so precise? The stolen photos couldn't have told so much, but that doesn't matter as much as how devastating the gestures become.