I do like this portrait. I think Artyste was on the right track with his evaluation of the picture. Of course with situations like this the element of time is critical but placement in the tunnel could have been tweeked. I would have possibly liked a turn in the tunnel behind the child to eliminate the green. A great expression and really good album picture.
Good framing. Think the face and arms are litle to overexposed and also the colors suffer for that. Looking at the hair and other parts of the image it seems litle oversharpened to. All the same this image has some potentials and seems pretty good.
I would have rated this higher if you had been shooting him further back in the tunnel, although I suppose that would have played havoc with the lighting. Perhaps with yourself in the tunnel, shooting him at the end, with the tunnel surrounding the shot?