Thanks Donald.
Framing a shot such as this in low light can be a bit "hit and miss" for me but in this case I have shot this location before and that helps. One thing I have found with photographing surf with relatively long exposures is that the timing of the shutter operation can make quite a difference to the effect obtained. It all depends on when the waves are breaking, not so much for 10 secs but for exposure times around 1-4 seconds.
Dave