if you expand beyond his head to the girls in the foreground, you’ll notice they pixelate too when the area is enlarged.
The texture of the brick near his head is different than the texture of the brick farther from his head, and the texture has a sharp demarcation. Also, the gray hoodie on his neck has a poorly done straight edge at its lower border. The texture of his dark jacket also has a sharp demarcation in contrast near the gray hoodie on his chest. The head and gray hoodie were added in.
No question in my mind it’s fake.