not liking the white circles, but the planet is cool, especially the texture. the space/bg effects are nice, but there's a lot of black empty space. I'd like to see a version without circles
I'm with Ryuuji on the white circles. I'm not too fond of them either. Try a version without those. Also, you can sort of see an outline towards the dark end of the planet. Not sure if that was on purpose or not, but I'd get rid of it, or at least make it less noticeable. Other than that, it's really nice!