Instead of just making it black, couldn't you make it black than put a slightly transparent light gold frost over it. I'm not that famular with painting programs-but that way you would have a slight gold tint over a black background and it would look more real.
I really liked it with the astronaut in it (I like anything with astronauts-thats what I want to do). But, I was just trying to make a suggestion-I hope that you didn't remove him because of something I said.