i agree indians of mexico aren't easy to take in foto when you don't know them personaly... You can imagine they don't live in the towns. This woman was in the street, representing her population, in a manifestation for her people. Her expresion is a reflect of this act, witch look like an obligation for reprensenting themself front of the modern world, that we can let them a land to be and to breath. You'll understand that this act is like an humiliation, and be shure that if i had the possiblity to take a picture of this woman in her environement, her expresion should effectively be diferent, but i'll probably have dificulty to find the same miracle in the plumes
Ps; there is many way to see a picture and to understand it !!!