This photograph depicts a woman ('mestiza' in the Spanish title, i.e. of mixed descent) drinking chicha. This is a slightly alcoholic beverage derived from the fermentation of cereals (often maize), fruit or cassava, already in use in pre-Columbian times and still very popular in the Andean area.
Sitting on a chair in what looks like a courtyard or a street, next to stone buildings, the woman wears typical clothes of the campesinos: a wide, rather long, dark-coloured skirt (pollera) and a short cape (lliclla or manta) closed at the front with a complex circular metallic pin. Resting on her shoulders as a sort of second cape is what looks like a cover with an embroidered border.