very promising

keep mapping

Reguarding the columns in the first pic, they dont seem to be uniformely spaced out (maybe its just the angle). Even if it is just the angle they either need to be reduced in size, or have increased gaps as they look cramped, paticularly between a the two corner columns. A better way to tackle this would be to have the corner columns in each corner and then space out the other columns equally in between, and using this way they can be cramped as you like.
As for lighting, you have a good grasp of it already, what alot of mappers dont realise is that maps dont need to be at 100% visibility in the entire map. The slightly darker areas really attribute to the mood of the map.
Texturing is decent aswell, im not a big fan of rusty textures, but thats just me being opinionated.
Doors look smexy, just a random bit of advice which would look awesome is having multilayer doors, right behind the door you have, make another one but with the panels at different angles (e.g flip the panels, so the top panel is at the bottom and the other two at the top) and then when it opens it'll look great.
keep up the good work.