Vertical photos, I think, are not as much photographed as horizontal photos. I love verticals! Such composition tends to add depth and contrasts. When I want to emphasize the cloud patterns against a foreground subject, I use vertical composition, like this picture. I notice that switching from horizontal to vertical, the same object (taken from the same distance) will appear smaller in the vertical composition. The effect of compression. Well, if you are used to taking pictures horizontally, try taking vertically instead. Always good to experiment. Happy shooting!