Actually, I quite like it. I think the placement of the flag in the center of the image makes for a nice focal point. I always like doors in images, so having the subject walking out of the frame though an open door leaves a bit of mystery in the shot. Where's he going? What's he buying? Is he coming or going? We don't know. I also like the vertical lines in the center of the image.
I agree with Mana that there is a lot going on in the image, and that may not be for everyone's taste. But I think you've made it work. I like it, and I like that it's B&W, I don't want the emotion from color here.
Nice job.