The rule of thirds, which is not really a rule, would have you put the horizon on a third. But which third ?
Maybe either – a lower third giving a skyscrape whilst an upper third perhaps a landscape. Both can work and sometimes it is difficult to decide which gives the better result especially if the light is good and there is some drama in the sky.
Here the colourful cabin on Ile d’Oléron with the tracks leading to it formed an obvious subject but given the drama in the sky coupled with the rich evening light I opted for both compositions and still cannot decide which I prefer.
Both images taken with PL 100-400mm @ 100mm f/4.7 1/1,000s iso 400.