and the ceiling texture could be replaced by a cracked concrete material e.g with some decals of piece of collapsed plasters. and similar dirt could be added to the floor.
and wall textures could be also more realistic, if instead of the grey colour, you would choose another mat colour, to show that it was painted a couple of times before, but the layers are worn out, for example by keeping those white traces on that ugly greenish paint used in hospitals formerly, like in the basement of the Technical University of Budapest 10 years ago .
and yes, the maintenance crew is definitely concentrating only to floor clearing
.
