Hello.
This is my WIP of space scene - space station in orbit around Earth.
Earth Background is a cylindrical 8K texture extracted from Space Engine ( http://spaceengine.org/ ).
Character made in Make Human, clothed in Marvelous Designer, everyhing else made in Blender.
I could be only me, but usually working space stations are very bright inside.
Yes, you are right. I haven’t installed any lights yet. 
Also one suggestion, I think it’s a good start, the Earth environment texture is perfect, but space stations are know to be very efficient in terms of space, there’s basically no to very little empty space which doesn’t have a purpose. In these terms your scene is basically empty. Have you looked at space station references, I really encourage to do that, you will be inspired easy. Can’t wait to see the updates. Good stuff.
Just look at this for example:
