This was a famous Sioux warrior. More information on the person is provided here: http://www.hedog.com/
Drawn with Corel Photopaint using a reference photo taken by J. A. Anderson in 1900 ( http://memory.loc.gov/service/pnp/ppmsca/07300/07333v.jpg )
translation of my comment from the language of human beings to the white mans tongue:
hello
excellent
ah ho
Zuma
How do you know what colors to use? Is it a guess?
Great art !