Also, the way that the actor’s hand is lighter than his body suggests that a simple “travelling matte” technique might have been used, even in (2D) post-production. It could have been a simple horizontal gradient.
And … did someone put a subliminal face in the cloud, just to the (your-)left of the actor’s head?
Always bear in mind that “what you see on-screen, probably is not what first came out of the camera, or the renderer.” When you are reproducing the total effect of a scene “as you saw it,” you don’t need to try to get the renderer to do everything at once. Think in terms of a multi-stage production process, and “successive refinement,” to finally get what you finally want to come up with. (And you also do not have to limit yourself to just one renderer!)