Im surprised with the detail and sharpness of the grass, its spectacular! Also, I like crows.. Definately a plus! This is a wonderful picture, and it belongs in black and white.. Just the mood of it seems best suited in black and white.. Wonderful picture!
Not having seen the colour version its hard to say that B&W might not have been the best choice for this. But the detail of the bird is lost in the contrast of the grass. It's a damned fine urban composition too.
I do like the contrast of the bird with the city in the back but may have preferred the color shot vice B&W. Like the angle of the composition as well.