Very nice, love the composition.... funny you say that .. I took a few cloud/sky shots the other day with my 100mm macro and they actually look pretty good!
@ozziehoffy LOL Cassandra - before I uploaded this I absolutely agonised over 5 different crops, eventually giving up in despair, just nipping a tad off the top & bottom. :)
@ltodd True... I don't get wrapped up in my head about rules or thirds etc... I go with what I like the look of and I quite like breaking the rules lol.
I'm glad you didn't have any other lens with you, I would never have thought of using a macro lens for a sunset but it works perfectly and the softness of the background is lovely.