Hey, I think you've got a really strong sketch here! One comment I have is to check the perspective of the buildings. The more we look up, the more we can see the underside of the objects. I used an ellipse tool and slightly increased the size as I went to the top objects. I do think the vertical lines on that tall tower at the back needs a bit more refinement, but I don't know how your perspective grid is like, so I'll just point it out. Good luck!