Hehe...
...I prefer your music more than your art xP. Still, what the heck, this is a decent sketch. You can see that it's drawn by someone who's pretty much a beginner at sketching, especially when looking at the buildings, but this still is a cool art piece :D.
Well, as the others have said, adding colour will really give life to this submission. Right now, the picture looks cool, but it's a bit dull. Adding a few colours will make this piece much more interesting and fill in the detail that is missed out as it is now. That being said, the shading was really good, except for that little nitpick Coop83 mentioned about the fact that you shaded in different directions. Other than that, the shading was impressive.
As a picture, this is pretty well-drawn. I was really impressed by how you drew Sly Cooper. His stance was excellent, and he looked amazing. Just one little thing, though: I think his tail looks rather weird. Maybe it's its angle: the fact that I'm expecting his tail to be hanging at a 300-ish degree angle and not sideways when he's flying through the air. Still, other than the slightly awkwardly placed tail, Sly Cooper was brilliantly drawn. As for the buildings, I'll say this without beating around the bush: they were terrible :P. Lol, what I mean is, the perspective of some of them were way off such as the ones at the bottom, and the lines were rough and as if they were drawn in a hurry. Ruler, much? xP. Also, I totally agree with XwaynecoltX about the lack of shattered glass.
Overall, I like this submission. It's well-drawn, and shows that music isn't your only talent. Still, it has a few defects, but practice makes perfect, so good luck with any future art submissions you might do, and keep up the good work.
7/10
-Review Request Club-