Great pic, but, if it was real life, your son should not give him a hand to help him up, because the climber's weight would pull your son over and they would both fall. Also, the boy's added weight might break off the lip of the rock formation, and they would both fall. I know those fears are kind of stupid, but I actually think of things like that. It's all excellent art, anyway.
Did you choose the orange shirt for contrast, and the plaid trousers also?
Your street art is not just three-dimensional, it is four-dimensional because of the added photography. I think there is chosen composition, by timing, in the pedestrians' arrangement. I also think that your street art is composed to be photographed. It's a good idea to preserve it forever in a photo, especially a fun-photo like this one.
Wow, it is so wonderfull!! When I just look at the boy and the drawing, I simply seem to 'drown' in the image. It looks so life like, so fascinating!! It's just amazing. And then you look wider again and you see 'oh there's the rest of the world', like you have been daydreaming or something. Great!!