Have been wanting to comment on this for a while now, but just haven't gotten around to doing so As for colours and composition I don't find anything wrong with it, not exactly my mix of colours but that doesn't matter. As for that light on the right of the image, I don't know if that's supposed to be coming out of the 'missing' piece in the background if thats what it is, but it seems to round and end too soon before the image which is something that catches my eye. If it isn't supposed to a sort of beam of light, then I think it's a bit awkwardly done because the focus for me seems to be too far to the right of the render. It also seems that that light doesn't match up with the shadows on the render which seem to be at more of a 45 degree angle, and not so much coming from the side.
But otherwise, good piece!