Hell World in progress

For my kid's book illustration class, the "Hell World"

Tarterus IV

A so-called “hell world”, Tarterus IV is incredibly seismically active, with literal oceans of lava.  The one populated area is a penal colony tasked with mining in exchange for food and air they need to survive.  Once dropped on the surface, no one ever leaves again.  Obedience is maintained in order to receive the resources required to continue their wretched existences.