Screenshots of what you're doing.

nice but


At point 1 the corner looks not that good, because it cuts the texture ino a half. A trim probably would a good solution.
At point 2 the texture looks plain, maybe you also could use a trim there, so the windows have a better border.
At point 3 the sand texture also looks plain. i would suggest to use a patch for more depth and mainly stone and just a bit sand.
I assume at point 4 you just want to add a rail. if thats the case use something with much glass. It fits better to the overall style of the map.
At point 5, you need real stairs and not just ramps.