The main thing is not to speak about yourself, but rather other people, because it’s 3rd person. 3rd person uses words like “they,” “them,” “their,” “him,” “her,” and “it.” NOT “you” (that’s 2nd person), or “I,” “me,” or “we” (that’s 1st person). If you must refer to yourself while in 3rd person, you’d say, “this reporter,” rather than “I.”

Is the story supposed to be about a picture…or something in the picture?

“The demonstration began peacefully…..” You will refer to the characters by name, description, or title: “The police officer stood impassively as people demanded to be allowed into the arena where the politicians were meeting….” etc.