Thanks Gus and Ash, I'm touched by your poetic words and am therefore humbly prompted to respond with as much eloquence as I can muster.
A brief moment in time captured on the fly must inevitably be imperfect without the benefit of hindsight, for that is the nature and beauty of our random lives.
I didn't even think of turning the camera to the portrait aspect. The log is still there and there will be other sunsets so perhaps next time the opportunity arises I can try it portrait style.
Yes Gus, I pushed the levels ever so slightly to bring out the detail in the shadows but the sunlight was muted enough that I didn't have to adjust the highlights.
Yes it was spot metered.
Ash, I'm not sure if stopping down would have benefited because I think in bringing out the detail it would have become more of a snapshot and less of a picture.