Dystopian Wild West Environment Concept Art

For this project we had to create concept art.
With this environment I just went with the Dystopian and Another Planet. For this particular project we had to start with a blockout in 3D, we weren't allowed to sketch first just build they said. So I did and during the making of the blockout I came up with a story.

Humanity was exploring the universe and one of their exploration ships crash landed upon a desert (Tatooine) like planet. The ship was still functional it couldn't fly them off planet. So they cannibalized the ship to construct a city in the crater in which they landed.

Humanity quickly found out that they are not the apex predator on this planet so they started to organize a militia to protect the settlement. but even though they were in an undesirable situation not all of the survivors united to survive together and a criminal element began to grow in the city. The same militia that was just intended to secure humanity form the outside alien threat now also turned their weapons inward to uphold the Law with guns and fists, changing their name to the Marshals. The peaceful times are over. the people are not free, but free of fear. under the protection of the Marshals. or are they under their jackboot?