Process

So this is how I work.

I didnt include the pencil sketch but it looks much like the first image here. I work out my perspective and block in the buildings to make sure the structure is working and the composition looks cool.

Then I come back in and punch a couple holes in the buildings  and add the mangled messy bits.

And finally the colors. I might add a photo of a real sky to punch up the drama in the back ground.