Striking image. Makes you wonder how long that's been shuffled around by the tide to end up like that.
Is the sky desaturated? Looks unnatural somehow.Not sure about that.
When looking at the full size version it's massively over sharpened though (or maybe masking error s from the sky processing), with distinct halos around the driftwood. Back off on the sharpening (if that's what it was, or refine your masking technique if it was that), it's not necessary and is ruining the quality of the full size image. I'm wondering if this needed much processing at all. I think the subject is powerful enough to not need embellishment.