grtz,
i don't get out on ths forum often b4,but L put my 2cents in anywho,gwahahaha.
looks lk ur scene's going 4a worn-workplace feel,especially w the grime on ceilings.
if that's the case,imho the ceiling type u're using isn't the type u're going. u need a exposed slab look so it makes sense. that said,it'll look a lot better w added floor beams fr the 2nd story,where u can hang ur light fixtures.
hth. all the best.