where do those wires go to?

why would you have a tube come out of the wall liek that, go trough a supportcollumn, and go back into the wall?

try to make things plausible, and not just be there for the sake of having SOMETHING there, and you'll have you things looking five times better on a subconscious level.

try making some lights in the floor, and have some wires go into that, at least you'll show people that they're there for a reason.

for the weird corner-tube-thingies, try having a pipe just hanging from the wall, and having a T-junction where it goes into the wall at some point, or into the roof/floor.

or add in a little S-curve to make it go lower in the middle of the hallway, and hang some kind of thing (display screen for something?) there for example.

(in short: right now it's just some THINGIES repeating, try making the thingies more into objects, and throw off the 1-tiling-thing-only feeling you've got going on.)