Luv, I'm very happy with your map. Beautiful progress, made all the better by your own creations. I think I will disagree with everyone who says add crates, becuase to me, this is a very Spartan level. Clean, well-maintained, machine-like. It seems reminiscent of an Imperial facility or starship.
I will suggest, however, that you add some more detail in other ways. The area that strikes me with the most room for improvement is i nthe 5th picture. A bare corridor? No, you can do better than that. I have several possible suggestions for that area:
1) Extrude the bottom surfaces of the walls, and have lights follow the corridor, hugging the base.
2) Cleave square or rectangular surfaces out of the floor, and extrude them once by .01 and again by .09. Make a grilled surface that the player can walk over but see through on the adjoin, and beneath it have pipes, power cables, or maybe even a lower level, or sewage system.
3) Do the same thing with the ceiling, only you could also have lights or air ducts.
4) Either extrude more lights from the walls, or cleave pillars, support frames, various metal beams, or even control panels. Every area needs a purpose of some kind. Corridors link areas, but the more interesting you make them, the more the player will enjoy traveling through them and the rest of your map.
Just a few simple suggestions. Whenever you get to a new area, or even when reviewing an old one, ask yourself, "What can I do to make this more visually appealing and technically satisfying?"