If you used the Monochrome setting in your digital camera I would suggest that is wrong.
It is better to make a color image and then convert it to B&W post process.
That way you have lots and lots more control of the contrast and density of the B&W tones.
Nice idea -- I would have tried to move forward past the two trees left and right and use a wide lens if necessary to catch the tree with the pigeons.
This looks liike a tricky situation for a number of reasons. You're already at a wide lens setting, as the corner distortion shows. The left upper corner, with the building and the name of it, is distracting. The degree of contrast between the sky and the dark tree bark is very high; neither the wood, nor the sky show much detail, the sky being so light I assume that might be why this was convertet to B&W.
This is also a busy scene, shot at medium-close range. I do LIKE the pigeons in the branches, but there are some elements that distract, like the building and sign, and the potted plant, and the streetlight. I dunno...this seems like a tricky shooting situationt to me. With JUST the right camera-to-subject distance, just the right camera height (low to the ground I think), and JUST the right focal length, perhaps you could have minimized the background buildings (camera very low to ground) from up-close, with a fairly wide angle lens.
But I'm not 100 percent certain about how good an image could have been made here: there is a LOT happening, and it looks challenging, to say the least.