Found this when reading Digital Landscape Photography and just feel it helps to highlight my point from the previous project.
"If the sky is more interesting than the foreground, place the horizon so the sky occupies more than half of the image. But if the foreground is more interesting than the sky, place it so the sky occupies less than half of the image."
"Remember that not all images must include a horizon. And when overcast skies prevail, compose the image to completely eliminate that featureless bright blob, because it grabs the viewers eye and belittles the intended center of interest."
"Occasionally a mid-image horizon does work nicely. Perfect mirror reflections of a landscape bathed in light can be very appealing with the horizon in the centre of the image."
Taken from pages 129-131 in Digital Landscape Photography by J & B Gerlach.
