The return of the lizard human

This is a little world, that I dreamed of last night as of first editing this article, and just happened to like. While most of it based on the dream, I will probably allow myself some artistic freedom to fill the gaps, where the dream doesn't provide sufficient explanation.

The world surrounds about a bunch of humanoid lizards, who live on a hill in small stone caves. They move on on those hills by sleighs consisting of tins and have invented shovels to fight off predators and dig the holes they are living in. They are approximately half the size of an actual human. This sketch shows how I thought their caves would look like. I am planning on also drawing the lizard humans themselves, but all my sketches yet look awful, so I have to practice drawing a bit, before I start drawing those.