Okay, I'll mess with my own rule and pass a smart-ass opinion about what might have been: for me, I'd have attempted to have the distant prow(?) of the boat pointing a little to the right of the shot, thus creating a sort of arrow effect using the three main lines: the generally descending tree-line, the horizontal water line; and then by angling the boat, its upwards line too, performing a neat Scheimpflug concept of its own!
Then, the people could or could not have been present, and mattered not a jot. Much like my comment, in fact.
;-)
Rob C