Concept Art for a video game - Heavy Gear Assault, which is in production. www.heavygear.com/
This image is not available to buy as it's copyrighted by the client.
Painted in Photoshop CS5. These images were created some months ago.
The top image took the most work, as there were numerous revisions and redesigns which were done over a few days, on and off. The bottom 2 images were done very quickly, maybe an hour or so each.