Professional investigators, or at least those who will be conducting interviews and/or interrogations, are trained in what is now called statement analysis. We're taught to listen/look for both vocal and visual cues (including body language) from those giving testimony. This guy exhibits a number of the cues for someone who is being deceptive.
Most noteworthy to me is how hard he tries to convince us he's being honest, immediately denying he did anything to fake/manipulate the photos. He really goes over the top in the second video swearing on his family's lives he's telling the truth. As I said before, he's protesting too much.
