It looks nice, but the planet texture looks a bit low quality. And it seems only the left side of the planet is textured. Either way, I don't know on what resolution you started making this planet. But with space scene's, it's usually best to start with huge ass resolutions (for a planet, 2000x2000 pixels would be good), finding yourself an encredibly high quality texture of rocks or clouds, whatever. Create your planet, and then resize it to whatever resolution you want. That way, you'll be ensured of a high resolution planet.