Try focusing on one thing at a time. I’d say leave the lighting for now and just focus on getting those textures done. Trust me, after many years of this, I’ve earned that tying to do too many things simultaneously tends to end up with an unfinished project.
Just a quick note on the lights though - this structure would be getting a lot more illumination from the planet surface, as well as what appears to be a nearby star in your background. Your current lighting only appears to account for lighting installations on the structure itself. Space light is very harsh and very white. I know, because I recently finished up on a space project myself! A good place to look for references is NASA’s site - they have tons of photos from the ISS which show the structures in a lot of detail. The Japanese ISS module Kibo may be of particular help, since it’s also covered in metal panels.
Also, you have so many structural lines in your scene that it seems a waste not to exploit them for compositional effect. Do you know the artist Ryan Church? He does a lot of really cool, wide angle paintings that exploit converging lines to create really, really strong compositions. I think if you check out some of his work, you may get some ideas on how to strengthen your own piece. Remember that your lighting also aids composition because highlights become visual cues, so be sure to place your lights in such a way that they illuminate the focal points while reducing the background.
But for now, just focus on those textures!