That's a tree. It's likely that part of the person doing the shining is visible from behind the tree, but there's too much motion blur for them to be distinct.
In my view, I can see what is clear, to me, a right arm, a left elbow. I can also see the head, but that one might be part of the tree (actually, a wider wood board supporting the thin tree, like in other trees around), but it seems unlikely to me. I can also see the right and left legs of what is probably a boy sitting over a box.
In my perception, I see what is probably 80% of a boy’s body, covered only by a thin tall branch of a young tree.
I would definitely not say it is the picture of only one human.
> The first photograph of a human: a man getting his shoes shined on a Parisian street corner, by Louis Daguerre, 1839
I believe there are two humans there, one getting shined and the other doing the shining