Looks pretty nice, but if I were you, I would make the textures on the planet stand out more, make it more detailed. If you take a quick look now, it looks like a normal monocolored orange planet if you start to look a bit longer you will start to see a couple of color differences. You should make darker areas darker etc. Also, draw some stars on the background, looks so boring now, space is full of stars, not just a black void.