Yes, this is an important decision, is there a way you could post a few pictures of your train room, floor, walls, ceiling, door ways, light fixtures, wall switches, and most important, the actual size of the train layout area. This will help. Something else, is your train room in the garage in 
basement, or bonus room, Where?
Now, if you decide to paint the ceiling Black, I suggest satin sheen, and black color track lighting. Finished basement room.
My ceiling is 8’1 inch high, with white grid/white 2 by 4 panels, white track lighting all around and over the layout. Also, there’s a 60 amp breaker electric box designated only to the layout.
Bob Bartezek’s layout, a fabulously designed layout, has a black ceiling, black track lighting, the lighting is focused on the layout bringing your eyes directly to the area your seeing. When you go down the stairway into his World of Trains, you see a large trestle that’s meticulously made and to the right a 34 inch Millhouse Tutntable with many beautiful steamers ready for duty... A must see layout.... Awesome...
Good luck and get to work. Happy Railroading Everyone
