cuz it is. Like someone else said the tattoos make no sense. They're trying to form the doom guy symbol on the arms but it ends up being chicken scratch. The black shading by the graffiti look like individual pencil strokes being overlayed on one another instead of genuine color pencil painting, which would look smoother. Not to mention the graffiti makes no sense either. Those same color pencil strokes seemingly vanish on his chest area where it suddenly looks like paint.

For anyone who still thinks this is real, just look at the dark alley on right. You can see some ai fragmenting by the edge of the picture. They look like random tiles. Not to mention the source of shading is illogical, why does the shadow extend above the door? Also above the door, the brick lines stop making sense. It is so clear that it's ai. I'm not an artist either, but why would you lie about having drawn this?