It doesn’t really look like the sort of image one might find in a yearbook, it looks like a snapshot, but there’s no way we will ever know, unless we see a book, is there? And that’s most unlikely. One Freeper who contacted the school was told...we did have some yearbooks here but they were all stolen...maybe they were?
That may be because you're in Australia. In the back of my old yearbook, the local businesses would buy a quarter size or half size page for their advertisement. It would help pay for yearbooks. They'd usually have the student/s who worked there and the owner in the picture. Of course, each one would have a sign or some other indication of the name of the business (well, duh, it's be silly not to have the name of the company in the advertisement, right?). If the student wasn't standing in front of the business' sign he'd be student pictured as acting out his/her job like wearing an apron in a bakery, behind the counter at the pharmacy, arranging flowers at the florist, or at the cash register at a clothing store. That girl in this shown picture is acting like she's talking to the person at the cash register so it's obvious that picture has been cropped. Was there a sign that identified the store in the missing part of the pic or what?
Meant to add that there is what appears to be a turnstile or entrance swing gate in the picture. That might have been where the business’ sign would have been.