Here's the cover from my first published book. It's not perfect (the color of Mars is wrong, I don't know what the blue swoosh is supposed to represent, and there are no stars in the background), but I'm just the author. I have limited input into the creative process of designing a book cover. 8^} At the very least, it's eye-catching, no? (Click on the image to see a larger version.)
If you look closely, you can make out the cables and the cars of the space elevator connecting the Orbital Docking Facility to the planet.)
Update: The Mars Imperative is now available on Mobipocket.com and Lulu.com, as well as the publisher's web site (shadowrosepublishing.net).