I like the bottom zag. Makes me think that the zag's walking along. And I think you've framed this really well, with the vertical zags to the side and those decreasing width horizontals from the steps. Nicely done.
Not bad - well processed. I just tend to prefer this sort of shot when the shadows are situated more diagonally across the steps. I like the bottom right corner, and if anything, I'd be more inclined to crop the top a little.
After reading the above comments I'm going to "flip flop" on my "zig zag" cc. The last zag is unique and interesting. a little off the top might make it more of a focal point in the shot.