Hey @jonatan-moonchild, thanks so much man, those are some really solid points. I really did notice that I hadn't done the entire sticks on some of the teepees - those could definitely use some better shapes on the background ones, thanks so much for pointing that out.
I'll test out some more layers of buildings. I keep struggling with the idea of what's too much and what's too little. I try and keep things simple, because I normally tend to over-complicate everything and over- texture - I'm really not sure when it's just right or enough 
So I'll test out some extra layers, but I may decide to keep it as a wall - have that part of the city be simpler and have the layering happen where the character is pointing.
The aurora is also a great idea, I'll think about it, though with the green of the radiation already there I'm not sure if I can put more green lights in the sky, as it might read either as more radiation or the radiation might read as more of the aurora.. Like I said - I tend to overthink things
The entire sky might need replacing, I think it may have too much of a brushy texture going on, not sure it matches well with the rest of the image.
Thanks so much for the feedback, really great ideas and will definitely implement.
As for finishing, I might just call it done and have a look at it again in 2-3 weeks before calling it final - final. I just know I tend to reach a certain place with a piece where almost nothing I'm doing is moving me forward, so in terms of getting better - I think it benefits me more to start a new piece and attempt to execute it better with the lessons from the previous one.
Thanks very much Jonatan!
