Problem

Good day

My wife and I have to work a lot, so when my grandparents can't look after our son, we hire a babysitter. The babysitter is the daughter of a good friend of my wife. Although she's only 15, she's actually very good at her job, it's cheap, and our son loves her. The babysitter likes to take photos, which she's happy to send us to show us everything she's done with our son. Today, there was one of the pictures I'd rather not have seen. The babysitter was at the playground with our son. The playground is about three minutes from our house, and you're usually alone there. The playground isn't the biggest, but it even has a portable toilet. Unfortunately, you can see from the picture she took that our son didn't use it. In the picture she sent us, you can see our son peeing with his pants down on a bush in the middle of the playground. Firstly, I don't think it's good that she didn't send our son to the toilet, but I think it's even worse that she took a picture of it. My wife also thinks he should have gone to the toilet, but she finds the photo extremely cute. I, on the other hand, think that's completely unacceptable. Doesn't that already count as a pedophilic picture? I'd like to hear your opinion on whether I'm being too harsh or not. Also, how should we tell our babysitter that we'd prefer our son to use the toilet without us getting into an argument? She's actually doing a very good job, and the photos she takes of our son are lovely. I look forward to your answers