Good sugestion about the windows, they where a little on the large size anyway imo.
About the detail, i can't bring in too much detail as tiling will get obvious, i'm planning to make 4 variations of regular tiles and i don't want tiling to be noticeable, unless you going to study it
. I will be adding decoration to walls like posters, gravity, pipes, etc so that will break it up some more too. I guess i have to experiment some more to know with what i can get away with.
I do have trouble adding in those wood grains, i have only 6 tiles for each plank inc. the edge. Adding some hard contrast to some planks doesn't look that good.
I did have a go at another concrete tile but i'm not sure if i like it better, i did try to add those darker edges that get created when pouring concrete between those wooden boards. And took your advice on the bolts. Anyways here it is, lmk.