Of the two, I think the one on the right is more effective because you can see the human. He’s much harder to spot on the left one. But that being said, I hought the size and palcement of the human in the earlier posts was stronger: He didn’t seem so far removed from the rest of the composition. In the latest right thumbnail, he’s separated from the structure and feels less well integrated into the scene, more just thrown in there. Composition-wise, I feel like the previos post left image was the strongest yet (compositionally, not color-wise. I don’t have a stong pref which palette you use.)
Are you also going to include an alien in there as well? (I could be misremembering, but don’t the rules specify human and alien interaction?)
anyhow, not much time left… Good luck!