Owen the image is generally well thought through and I can see what you were trying to do but for me the individual elements i.e. the sand gullies, the waves and the sky are just not strong enough to pull it off. The sky also is a little distracting, despite its good proportions relative to rest of scene, because of the unevenness of the toning. Did you use a polariser?
As a suggestion perhaps the use of a neutral density grad may have evened out the sky and prevented blowout in the left side.
A standout wave or single obvious break with say a set of footprints walking the ridge between the 2 left side gullies disappearing into the water may have produced a stronger compositional image. I think to achieve the sense of tranquility you were after perhaps a little closer to dusk with a little more colour in the sky may have also helped but I can see where you were going with it. Certainly worthy of another crack at it.
Hope this is useful?
cheers
marco