It's wrongly packaged, the map should be in base/, not in the root of the dirctory
the skybox is referenced incorrectly in the CFG file (should be loadsky Newsky/sahara, not Newsky/Sahara)
unneeded /'s in the cfg file
You include about 7 or so skyboxes, whilst you really only use 1, why?
the mapshot is incorrectly named (it should be .jpg, not .JPG)
I would also follow dairyking's advice about the windows. the glass doesn't exactly look natural, and fights with the consistency of the rest of the map.
The lighting also looks 'unnatural', ever consider using /ambient and /skylight to remedy this? /skylight 127 100 50 (half of the sun's) looks quite nice on the map
EDIT 1
just thought I'd do some before and after images
~Hirato Kirata