from the first screen
your geomtry is too simple and cubic, you have these typical things, wich is very normal, like a big wall and in the middle you place a thing, in this case a airvent, cause you thought, well the wall is empty soo place something there, thats good, but there has too be unity, conectivity in the geomtry, the airvent has actually nothing to do with the surounding stuff, it needs interaction wich the rest, so make a leet pilalr support thing for instanc,e that supports walls, roofs, runs all over the place, and then put some airvent between, conect it, let their come wires out of it, and so on, that is much leeter, this looks too much like cut and paste, you know, lots of little pieces by eachother
ceiling is empty too, in second shot too
in the 3th shot you have a good thing, these pillars that hold the bridge/catwalk, you see, it supports hte lfoor, is a pillar, and goes too thew ceiling all at once, creates interactivity, you want that more, and the broken grate, or dunno what it calls in english is nice, and the light is too white imo, white is boring
but you are getting better indeed
)