This photography is not a selfie. The word selfie has self in it which can be understood as something that you do by yourself. Also, selfie photos don’t have torso of people on it. Most of the time we can see neck and face. People on this picture have scared or surprised facial expression. The cause of that kind of facial expression could be that this picture was taken after funeral because both subject wear black color clothes. As we know, Richard Avedon likes to talk to the subjects during photoshoots so we can assume that the facial expressions are caused by something he talked about. In my opinion Richard Avedon was talking something really tragic or surpassing that cause Duke and Duchess to have faces like that.