Nice work, you've been doing a lot of work on this.
You have an awful lot of godrays, almost as if you have light coming from most directions, i think this distracts a lot from the map, because its quite bright, try and use godrays as little as possible, its just key to putting them in the right places.
On
this image you have like huge metal supports running over the sky?!?! With lights!?! Okay maybe its bad perspective but, wow.. just get rid of those because there really quite horrible.
For floor lights you have quite blotchy yellow lights, i really dont think they work too well, perhaps try and a more darker orange, too bring out the rocks and surrounding metal.
In
this screenshot im having trouble identifying where your main light source is coming from, but I really like the blue lgihting coming from below, i think you should flow with that, nailing down yourself to atleast two main lightsource, i sharp blue upcast light lighting primarily the rocks and then a much wider light coming from the sky. Do not be afraid of leaving only floor lighting to light some areas, you really need more contrast in lighting.
Also the white lighting is a bit bad, try experimenting with other colours.
Good Luck