Looks good to me. Only thing I'm not a huge fan of is the fresnel around the entire planet. Maybe less brightness at the top right and lower left? Might just be because the lightsource is from behind, though
thats pretty neat looking. maybe the rim shader, or in this case the atmosphere, is too bright where its dark on the planet. while it would be that way, i might tone it down a bit.
show a shot with the sun lighting the side that the camera is looking at so we can see that aspect of the shader better.
seems to me like your sun's light is too warm and your clouds dont seem to be thought out as far as their grouping. theyre just kinda scattered wherever. Try more swirls and groups of broken up clouds and spots with absolutely no clouds at all. and perhaps keep the poles in mind more too as far as cloud grouping. im pretty sure clouds are affected by the planets poles?
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show a shot with the sun lighting the side that the camera is looking at so we can see that aspect of the shader better.
http://www.theearthcomesfirst.com/earth.gif