The Placement of Rocks

I looked over the railing that is a couple of feet from the sidewalk when I saw this boulder in the water.  then I saw all the smaller rocks, and then even smaller ones.  I liked the spots of blackness in the water and on the beach.  So the trick was, to see where I wanted to place the rocks within the frame of the viewfinder!  Clearly I was not going to move any rocks for this photograph, except by deciding where the edges of the photograph should be for the most interesting image.  I think this composition works pretty well.  I have passed this spot a billion times but have never, for some reason, looked at all the different sizes of rocks there.  That's what made me stop this time, for this photograph.