This is a fairly comical photo, however, I think the caption draws away from it. It's quite long and not very Larson-esque. I know this was a Larson tribute, but it seems the shots that recreated one of his works did a lot better than the ones that were tributes to his style.
The rock head seems a bit out of focus around it's mouth area. The James Brown head is quite dark. And there are a lot of reflections in the boy character's face.
It was a good take and the composition is pretty good.
I think it would have scored higher if it was a recreation rather than a tribute shot.