Global

first i got a picture of the skyline of NYC with the two twin wtc towers.
The Picture was in Black and White. First i cleaned the Picture from Grain and replaced the WTC Towers to a plate of the sky. Then i gave the picture a new sky.....with a bit of shining sun.
Now i rendert the Parts of the cars and the Heli in four layers and two extra layers(illumination map).

I composed it and that is the result.

Happy rendering,

Mainframe123