I agree with others - the sketch is the way to go, you did a great job tweaking it and putting it into the map. I also like the city background/texture. Nice touch.

The only thing I would like to see is the scale changed. I feel like the interior of the tower has so much potential, but its represented on a very small scale off to the side. I'm not sure if you're pressed for time and need the map done now, but I'd love to see the the size of the map changed to include a more detailed layout (perhaps still sketched).

Overall, great map though.