give me a week and ill do it for you
but his does look good, i wanna see how you did the sun, as suns have always for me been just a bright dot with a lens flare
and from the looks of it, you have done the photoshop equivilent of what i do to make my earthlike planets
edit: browsing through it, it looks very good
just a thought tho, for the ring, maybe make the gradiant one that is black and white (black then then then black etc) and then add black and white noise (i use hsv noise for that in gimp) and set the mode to screen, then use some coloring tool (for gimp i use colors--> color balance) and make the lighter parts, none of the black parts, whatever color you want (for gimp, using the color balance, that would be mostly highlights, and that other one, cant remember it... but basically all but shadows .
That makes it look more like its made up of like rocks and such caught in its gravity and orbiting it, since thats what most rings are made of