I usually leave the starfield as is (but at 50% brightness, and maximum stars). Usually, I like to mess with the colors in my pictures in another program, boosting the contrast and brightness very high to make weird, and bright colors. When doing this, though, stars get even MORE large and bright, which is why I make the brightness around 20 or so, so that they look normal. But I dont really think stars are so important in a space scene. Sure they're there, but I bet if you never showed them, people wouldnt notice strait off.