It was a photo op for the tree deal, but I seriously doubt this was a "composed" image where they were posing. If that were the case, I'd guess the blond would have changed her stance a bit.☺
You are right about Macron’s wife.
I’m certain someone directed them as far as composition of the photo.
Now, consider the ladies are both in very high heels and on a lush lawn. Macron’s wife was probably trying to stabilize herself on that. It is an awkward pose.