Hmmm. Don't know about southwest or eastern tribes, except maybe the Cherokee. (A beautiful people ... my partner is part Cherokee).  But I do know a bit about the plains Indians.  You can find a lot about them in the artwork of James Bama (Who by the way use to create Science Fiction book covers when he first started out).  His work is very detailed and authentic. 

Also look up the Plains Indian Museum at the Buffalo Bill Historical Center in Cody Wyoming.  I lived in Cody for many years and worked at the museum for a summer.  Oddly here in the US the Plains tribes are the most often used in fiction and movies.  

Good luck.  

Boni

Boni

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"Be Hero to Yourself" -- Peter Tork