It’s one of the base ready packs from geek gaming scenics. Scrublands I think. I smoothed out the base first with some generic filler putty, which gave it a pale sandy textur underneath. Quick and effective.

For running around and shooting things - Boltgun.

For running around and stabbing things - Diablo IV

Fro driving around and shooting things - World of Tanks

Testors dullcote would be my recommendation. Should be able to source through your local hobby shop, or online through somewhere like Amazon.

Here’s one, though can’t speak to the quality of it.

https://cults3d.com/en/3d-model/art/mayan-doll

Printed in a single colour, then hand painted with acrylic paints.