In reply to Fraser:
I'm happy to agree with "unnatural" rather than "fake". It's a technical tour de force, and in lots of ways I wish I'd taken it, but why does it look unnatural?
Well, I think, in no particular order: 1) it's knowing that the Northern Lights part of the image would have required about 10 secs exposure, if not a bit more (which, surprisingly perhaps, is quite a bit for shooting the Lights), but the wave was shot at ?ca 1/250th. This means that to my eye there's an imbalance in the movement between the reasonably sharp, "frozen" wave, and the blurred N Lights which, unlike waves, move quite slowly when they are relatively unintense - as here.
2) The light sources: moon + N Lights should be backlighting the waves, but they're front lit from an obviously different source.
3) The very bright reflection on the crest of the wave of - presumably - the flash, and the reflection on the water is too intense, dominates the balance of light across the image (in the wrong place), and holds the attention. If that light weren't there - impossible without PSing it out, I suppose - then the image would have more balance.
Fascinating picture to admire technically and to think about.