Ahhhhhhh! The tremendous lure of a Cornish beach..... is why I am leaving in the middle hours of tonight for a few days having a go for myself and then surfing when the light is poor!
Back to the topic. Interesting range of responses. Deceptively simple image with tension between the rocks RHS and light tones of stream. Another important element as I view it, is the enhanced colour contrast to offset the sunset sky created by the blue colour cast in the bottom RHS caused by the incident lighting from the clear blue sky overhead.
He uses this technique to greater effect in "Contours in Blue" which I consider one of his best pictures. Sorry, best link I could find..... http://www.leefilters.com/ShowImageByID.asp?PageID=461