hey everybody. I just made some art for a game called "mars: land of no mercy"http://www.marsnomercy.org here is the picture. Blender Internal
Nice, it reminds me of Star Wars ;). 
I think it would be better to see a little more detail on the robot on the ground, as it is lit from behind, all we see is the silhouette, and it seems like there is more to be seen.
I would suggest putting an orange or blue lamp in front of it that doesn’t cast any shadow.