Your texture is amazing, and I love the star field. What I don't understand is where is your light source(s) is/are. While your small planets seem to be illuminayed from topright corner but the big one is a bit messy.
what i tried to achieve was a very small light source at the bottom left and a main light source from the top right. what i think confuses most people is that there is not sign of a small lightsource at the moons and the planet seems to be lighten up by a third light source just below the main one. will fix it