you are not using those prisonbardoors correctly
like step one would be to not put a door in front of a solid wall, because the only reason to do that would be to play a joke on a blind person. they open the door and try to walk through and WHAM it's a wall
step two would probably be to find a version that doesn't cut off halfway in the middle of a bar on both the left and right sides. that jailbar tile is only designed to be used along with the end-pieces on both sides of it. i'm pretty sure there is an actual door version of that tile, right?
also stalagmites don't grow out of tile floors, they only grow out of natural stone. recommend you use indoor doodads probably.
is this a prison? try actually showing the cells, with people and beds in them, instead of just putting black ceiling tiles where they should be. I think it'll look much nicer. I had a prison sort of like this, and redid it like that and it looked 30x better. but then the water makes me think maybe this is a sewer, not a prison. confused.