The meshes look cool.
I don’t understand how you did for the lighting and i don’t understand where are the light sources. You should redo all the lighting i guess: a directionnal light outside (which would give you nice shadows on the entrance floor btw) and some spot/point lights for the interior…
a skydome also.
Don’t hesitate to put some ‘light meshes’ here and here (on the ceiling or between a wall) to define the places you will put some spot/point lights.
Keep up, it could looks really good you know