This is an extremely evocative and powerful ethnographic image. The strength of emotion behind Juan's eye's forces the reader to consider what was he feeling at this moment in time? Did he know what was to come next (stripping, sprayed with pesticides, dehumanization)? Was he angry, humiliated, frustrated - or a complex mix of many emotions?
As an aside - given that you (Salvador) and Juan share last names, are you related? If so, what types of information might you have access to that an outside researcher would not? Conversely how would such a relationship complicate your position as a scholar?