Nice color/contrast dude. You picked a good time of day to walk about. I wonder if it would look better with the sides of the box going straight vertical rather than having the top perfectly horizontal. Hard to say since sometimes getting one side orthogonal makes the perspective weird.
The box is on an angle. I would have rotated this so that the vertical lines are straight. Other than that, it is not a really interesting subject. The idea was good, but a more interesting, or colourful piece of grafitti would have worked better