If you have the time, maybe add more contrast to the chopper. Pretty much everything has the same matte surface, and also some higher contrast (darker planes and bright highlights) would balance the composition a bit more by giving the image some priority of viewing. More still, if you could widen the top propeller blur, I think it'd make more sense. Maybe shrink the figures a little too, to increase the sense of scale in the painting? Obviously, still an awesome pic though!