This boy is among those local 'professional' photo models, that means, you should politely ask him if you coudl take a photo of him (if you do speak Spanish or even their village language) and then pay, usually 1 sole per photo. He will never forget to remind you 'tip' in Spanish if you did not pay. Many people suggested not to pay the children directly but rather, to their parents. But then, parents are not always necessarily around.
Women in Cusco area always carry a big belt behind them, what inside sometimes hard to tell, being them either babies, young children or stuff.
Local people are very deligent, they constantly making yarns with their never-leave-hand spool.