To be honest, it's actually quite beautiful. If I'm not mistaken that light-blue star cluster follows the shape of the logo but either way it's a really cool effect. Only minor gripe, and your work seems to have this as it's only flaw, is that it's rather empty around the sides. I know it's hard to fill up a banner but maybe some text or to fit with the space theme some planets could have been added in. Although I assume that when you're doing requests it can be a little harder to be more creative.