Hey, David.
I just glanced through the images in that link.
Very nice.
On a few of the minis, though, the lighting is off-center. Se4 dosen't rotate those images, so there's a good chance the "dark side" of the planet could end up actually facing the sun(s)!
For protraits, you have a lot more flexibility, of course. Even placing a wrong-colour star in the background may not be noticed in a portrait.
Just some things to keep in mind when making these sorts of images.
(I'll still add what you posted, no prob)