Concept Art Piece

My Concept art piece, it could use some work but for now I am quite happy that it gives an idea on layers and composition. 

I re-created my final piece and have been working from that. It has been a really slow process because originally it was a variation of my original concept art and slowly as I was working from it and creating buildings in Maya based on it I tweaked it more and more and more and then it ended up looking like this.