The theme of the challenge is met by the wall your friend is leaning against and that's where the intrigue lies, it seems to consist of two different textures with the lower half giving a fascinating grainy appearance, unless this is your own partial processing? I love the stark high contrasts you have here and the shadows themselves are also quite interesting, they add another element to the scene.
Assuming the sloping shadow continues upwards as implied I think I may have been tempted to move everything further over to the right revealing more of the slope and excluding the pole shadow on the right and lowered it to just above his hanging out shirt for just his torso. I think this would have improved the composition and therefore its impact and hopefully have scored higher.
I do love the effect of the lower half of the wall. Nicely done, thanks for your submission and apologies for the delayed critique, as they say, 'better late than never', or at least I hope it is, Sid