A step backwards would have made it a little more difficult to spot Waldo. But the idea is good. At first I was going to say it is a little too dark, but you really need it that way to try to blend Waldo into the shadows. Good luck....
Not a very interesting picture, on its own. There's glare in several places, fuzzy edges from the light, and it isn't as impactful as it might be had you been standing in the center and included an equal portion of both walls. And the guy's hat is a dead giveaway.
Your waldo is easy to spot, probably easier still in color (the B&W seems to help him hide). Good contrasts, I have never seen a shot where the out of doors wasn't entirely blown out, so well done on that aspect! I can't tell what is the focal point, it seems to be about half way down the hall? 6 Swash