Opinions and sugestions welcom, mostly about he moons…
Although yours is a fantasy scene (and thus anything goes), from a physics point of view when looking from within a sky, anything darker than the sky must be within that sky. So your moons look like they are objects hanging in the sky rather than being behind the sky. Cool, but not realistic. If you search the web for images of “moon in daylight”, you’ll see how the moon looks behind the sky. When science fiction art smartened up its act in the 1970s, this was one of the changes in style. Nothing wrong with total fantasy moons, of course.
To simulate the “behind the sky” look in Bryce, set the material of the moons to “additive”. This will show only the parts of the moon that are brighter than the sky.
Below is an ancient Bryce4 scene from the last century that I’ve tweaked slightly in Bryce7. Most useful feature of newer Bryce for this was the much brighter sunlight available. Surprising but genuine coincidence of moon positioning and misty gullies.
Click thumbnail to see full-size image