In terms of modes of persuasion, the author has used a combination of logos and ethos and less of pathos. There are many places in arguments where the author could have pulled in pathos, such as when discussing paternalistic attitude of the dominant society towards the first people, or in other cases. However, the author has not adopted the pathos and has instead chosen to make use of the ethos and the logos. Ethos in persuasive writing will basically be an appeal to ethics.
Here, in the writing, it could be said that the author has made an appeal to the ethics of people to decipher images and picture stories in spite of the misleading way that they could be understood. Instead of an appeal to the emotions of the audience, the author has actually appealed to their inner ethics. The reader would be able to understand how some pictures are specifically created to depersonalize and infantize some things such as the Inuit people. The Inuit people are not children, but the way they are represented is the understanding of them by the photographer and is not actually a real image.
Logos is an appeal to logic and logos is the predominant persuasive technique that has been used here. The author has made use of arguments based on primary text so the reader is able to connect with the arguments better.