The feet on the sign look off. Since it's facing parallel to the bench and vending machine, the feet should go towards the left vanishing point as well.
Since the school building is tilted slightly you should see some of the side wall on the left (assuming the building is a rectangle).
The camera also looks like it's about 1m off the ground, but that's not a technical issue. If you wanted the scene to appear as if from the eyes of someone of a normal-ish height, the horizon line should be slightly higher.
It looks much better though ^^ Perspective is just hard lol