I took a lot photographs for this exercise, finding the majority wholly unsatisfactory. In the end I settled on this sequence which I shot in beautiful Marks Hall grounds.
I am showing only three here as these aptly illustrate the point required in this exercise.
Here, with a low horizon there is much more need to find interest in the sky. Fortunately the sky on this this day had some nice fine weather cumulous cloud formations which provided a degree of interest. Interestingly there is seemingly less depth here than in the first, high horizon, picture.