Some nice work here, I like the atmospheric glow you put around the planet. The yellow ring of clouds looks just a tiny bit out of sync with the equator, if you raise it a little it might look more equatorial. Now for the stars, it's a pretty good arrangement overall. I reckon they should be more uniform in colour - you've got a few purple and red ones that seem a little out of place. But the stark whiteness of the rest of them is a bit piercing and distracting from the planet. You could try making them a little dimmer. Maybe zoom in and add a bunch of tiny groups of stars like mini galaxies.
Anyway good work! I'll go check out your other arts!