The black and white really make this very effective. All the lines really beat the theme over my head and I really like that. The sky adds a nice break from lines though, I only wish you had added more of that.
I like the lighting and it's a visually interesting pattern of stones on the walkway. My eye is led down the alley but to what? Nothing of interest down at the end.
I am not sure whether there is an unambigious definition of leading lines, but in my book, they should be a line or several lines that lead the viewer's eye towards the main subject of the picture. I think that's not the case in this picture. Your pic uses a vanishing point rather than leading lines.
Great detail and sharpness, I like the tonal contrasts in the shot and the sky is very dramatic. great visual concept with what you chose to work with. I think you did well with it.