As promised, here are a few vertical shots I took at Disneyland in 2013:
Here the subject, Big Thunder Mountain, sits almost dead center of the vertical frame. You are basically drawn to it as your eye flys over the rooftops, down the path, and directly to the base of the mountain. I thought the leaves at the top right really helped to sell the distance of the mountain from the camera.
Vertical shots work best for really tall subjects, like this tower. I liked that it isn’t really centered in any way but still comes across as the main subject.
So again, the Matterhorn mountain is dead center of this shot. A tall item can work in a horizontal format as well as long as it is far enough away, but I prefer the vertical format for my tall subjects.
Having the busy elements of the lower third in shadows adds interest without competing with the main subject, and I thought the sky added a majestic quality to the overall composition.