Hey
Cool Idea, <3 Prince of Persia
The layout is pretty nice from what i got running around for a few minutes.
The lighting needs lots more work:
-the sunlight is too intense
-there are too many shadows, the shadowed areas are way too dark(night like), try /skylight 0x555555
-the lights from the lamps in the underground should be more inside the socket so it doesn't have shadows like that. In real world, the light source comes from the flame, not outside the socket somehow
-up the light precision to like 32, it kind of looks low quality in some places
Geometry/Detailing:
-the one ladder you have looks unreal, there is no way a person would have space to put their feet in between the planks, it doesn't seem like a ladder at all
-the stairs are too simple, having the same texture as the floor, they blend too much in. try making edges like i did in mediterranean and the skylight will make them cast shadows, emphasizing the steps.
-i really don't like grass that does not have the blades, it just looks like a green painted carpet
-carpet: try making them with a little height, it will look more detailed that way. Try to do this everywhere
Important: Oh man, no, i see you copied the pattern from mediterranean gardens(the spirals looking one). It's called the greek motif(http://www.google.com/search?source=ig&hl=en&rlz=&q=greek+motif&aq=f&aqi=&aql=&oq=&gs_rfai=) and i really don't think it suites a prince of persia map.
Anyway, good luck improving the map!