I quite like it. I would have framed it slightly to one side or the other of where you did, to give the sunset (bright mass) something to balance against (there are dark masses on the horizon in both directions, either would work). It's simple, but there are some nice echoes of line in the sky and water.
It's a bit *thin* content-wise, but you're clearly not intending this as an essay on man's inhumanity to man, it's supposed to be pretty. And it is.