I like the composition on this one. The bricks create a little path that leads you through the picture and the pigeon is on the path and nicely placed in the frame. This was an advanced challenge and I would like to have seen that utilised a bit more.
Adding a little more contrast might help this image 'pop' a little more...and either more color, or black and white or something might make it more interesting as well. Just a thought. I like the expression you caught!