I painted this from scratch in Photoshop CS5. This image is not available to buy as it's copyrighted by the client.
It's actually done in several layers so that it can be used as a matte painting with multiple planes. Once the client has produced the final animated scene I will provide a link.
I added atmospheric effects to complete the image for portfolio reasons, but the original matte painting doesn't include these effects as they will be added separately and animated.