Sweet, I think this is pretty awesome.
I think MOSFET is somewhat harsh in his oh so very detailed critique.
Though which structures, especially of this magnitude, you would want a feeling of solidity which I don't think is achieved with freely drawn lines. I noticed it right away that the buildings didn't seem so stable as they weren't drawn straight edged, but then I realised, who cares right? This isn't mean to be a blueprint right?
It's an artistic piece and I think you should always look for the creativity and idea found within a piece, rather than nit pick on details that aren't necessarily so important. If indeed there is any to be found, which in this I feel there is.
Like sure, it's a drawing of buildings and perhaps they're not structually sound but hey, I think you're trying to depict an epic landscape with a seemingly futuristic appeal, rather than detail a sound construction.
I feel you depict said epic landscape quite well and I really enjoyed this piece. The orange mist, to me, seemed more like pollution than clean air. It made me feel that this city is somewhat invovled in heavy industries with mass factories and what not.
Though also, I suppose it could be viewed as an orange tint from the morning Sun. I