What I did was a mock up for a Halo book. From what I know of the Halo universe, I implemented these renders into my final project. I applied hue/saturation masks, and opacity differences. I gathered things relating to the antagonists on the cover, such as ships, different types of covenant, and there homeworld. This took me a while to complete, as it was one of the hardest projects I had to work on at that point.