Dont sweat it man, the kid is obviously a 14 year old pre-pubescent chump lol. I can for him- More variation. Have some larger areas that are totally dark which isnt hard and then try to mix in some areas of alot of those lighter spots into more concentrated and larger areas. If you can, make the clouds harder and more textured. Less shadow bumpmapping, More actual planet shadow and perhaps heaver highlights on the lit side. Less atmo on the darker side. Maybe slightly large outer glow ...im just getting into preference now though...so I think thats it bud.