Right off, the question "What makes Diamond walk this way?" occurs, and the obvious answer would be "Why, Black Dick, of course."
But Diamond had not yet encountered Black Dick when this photo was taken. She is merely imitating the supposed effects of Black Dick.
From now on, when people ask me if porn performers really act, I will point to the life-size poster of this image on my wall and say, "This, my friend, is acting."
(Even if the person I'm talking with is not actually my friend. See? I can act as well.)