I search for scenes like this. The position of the bird gives excellent scale to the whole image. Pretty light in this shot too. It's relaxing to view. If there was enough room to shoot this horizontal without getting distractions at the sides it would cut down on the amount of blank sky at the top. I try to always shoot both vert and horiz when I am shooting this sort of scenes, as I never know till later which will be "the one" that stands out. The bird and reflection though, in the vertical orientation seem to work well to balance the tall shot. Nice.