you have a little defect in the image. one of the cloud layers you used is showing a corner/edge. top left corner if the zoomed in image. Other than that...fantastic ...you wouldn't happen to have tutorials on this would you?
i don't want to sound too naive however i thought this was a satellite picture of a planet until i saw the city lights near the bottom. this is beautiful. i don't have anything technical or smart to say about it but it is astonishing.