This looks really good!
I wonder if the clouds would make a more dramatic appearance if the were "fading" out less at the upper edge.
More compact brooding front line, bigger shapes overall.
The picture attached shows a free 3D model from NASA. This is a DSN70.
They have some nice stuff on their site. For another time perhaps.
And I hope you do not mind if I post it in this thread.
CHeers, Klaus