Author 'Denis246' (Original: Jofu) : The editing on this good photo of Joel is intended to stabilize the gaze, while keeping the artist at work. Naturally, the next will focus on the eyes of the depicted face. It is thus necessary to help this by shifting more outside the artist, whose main interest is the movement of the arm. The arm is naturally on the vertical axis at the left third and on the horizontal axis in the upper third by cropping.
The other element that is 'annoying' in the image of departure was the color of the face of the artist who draws too much the next. A simple passage en N&B solves the problem.
As well, cropped and in monochrome, the image is simplified by focusing the gaze of the viewer to the gaze of Mandela, while keeping the artist at work is very present in the composition, but without disrupting the reading of the image.
Finally, it is my opinion... and you have the right not to share it.