I've never seen that first concept piece of the futuristic Massai (or rough fictional equivalent thereof) before. Not the Proto-Predator on the rock that came just after, but the original inspiration for it, with the hi-tech Jason mask and Conan The Barbarian boots? It's an awesome design on its own, but it also works brilliantly as inspiration for the whole Predator concept as we understand it:
A tribal warrior culture that has advanced technologically, but hasn't changed much structurally or socially; they're more technologically advanced than anything present-day Earth can muster, but their way of life remains largely the same as it was thousands of years ago. I like that it divorces the idea of "tribal hunter-gatherer" from "primitive" and "modern Western civilization" as "advanced."
I can see why they used it, in other words, LOL.