The stars suck well
Now draw the surface.
I say you're pretty good, hell if I could get that close to a perfect circle.
A quick fix just because a sun would really work there[IMG width=500 http://i.imgur.com/5BzhR.jpg[/img]I think you should also stick with the old star setting, the new one looks a bit... is the word unorganic or aesthetically incorrect. Just lower their brightness a notch.