The Blue, it buuuuurns!
If you are able to get a good, high quality screen shot of the floor texture in the zone, you might be able to shrink and tile it. At very least, you should pull the dominant colors out of the textures and lay that down, or just use a plain parchment color.
I also prefer solid black lines for the borders.
Otherwise it looks very nice. Your lines are clean and straight. I like that you've captured all of the details of the zone.
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