Album art for "Abraxas" (Santana) and "Bitches Brew" (Miles Davis)

Question

Looking at the album art (below) for Abraxas by Santana and Bitches Brew by Miles Davis. Is there a commmon theme going on here? Specifically the African tribal people on the back covers?

It looks to me like either these people are representing a theme, the same artist did both covers, or some artistic theft has gone on.

Can anyone shed any light on this?

EDIT

It turns out that the artist for both album covers was Mati Klarwein which explains the style and the reproduction of the people.

But, the question remains, who do they represent (either as a theme or as a people)?

Answer 1

Well, Santana was influenced by Hispanic tradition. It's pretty straightforward. Bitches Brew, however, is different. Miles Davis started experimenting with improvisation and full rhythm sections. It explains the tribal and soulful feel of the album.

Answer 2

The tribe that is depicted are the men of the Wodaabe tribe. I am uncertain why they were used or what the meaning is, I’m trying to see if a reference was ever made on why their imagery was chosen.