This oil painting portrait of an American Indian depicts a Native American with his face painted white with a brown Coup Mark (Hand on Face).
Otter Breastplates were worn by the Plains Indians and were commonly decorated with Trade Mirrors. You can see them in many Western Paintings and Historical photographs.
Fur traders introduced Trade Mirrors to the American Indians in the 17th century. Reflective surfaces were thought to have mystical powers and these mirrors were quickly adopted for use as decorative additions to warbonnets, otter breastplates and bustles, as well as for signaling mirrors.