I forgot ages ago to show the final result of my planets for Noble Armada (I'm working on the third edition currently)
The moon had a nice rough texture. A good dark grey base cost, followed by a number of lighter grey and white dry brushed highlights.
Habitable planets, need water (nice blue green oceans), and continents and land masses using browns, lighter orange tones for deserts, white for the polar regions, and green for rainforests etc.
To start blues were used to give a feeling of strata of clouds.
The initial pass I wasn't too happy with. So more colour tones were added, and as you can see that gas giant is looking great.
Meanwhile, want to join the playtest?