Well can't say much but looks like you spent some time on those displacements cause they look rather nice.
My only complaint is the media is too early, needs more detail like as Rimrook said a Heli with red lights or perhaps a row of red beacons leading the way.
Use the arch tool for pipes.
As I said too early...I could make the displacements in 5 minutes...I'm only saying this cause at the Uni I looked at, the teacher showed us last years work and one man made a mod in HL2 with a desert and it looked just like yours only more deserty and dusty.