First, this is one of the saddest poems I've read in awhile. It's down right depressing....very fitting as I think the sea can be a lonely and depressing place.
Now as for the lay out I think you could cut back on some of the words/lines without losing any of the meaning or feeling. In fact the change would have the opposite effect.
Less is more...but let me admit to being a minimalist so really the choice is personal.
I love love love the water....it clouds most of my work in one way or another, so this some what drew me in.
I really liked the way you brought the waves in over and over...only I was hoping for something different before hand...like so:
The people fall from the clifftops
Transfixed by the rocks and lonely footprints
And the waves crumple beneath them
And the waves…
Maybe instead of saying
and the waves crumple beneath them you could say the water crumples beneath them...something like that...and cliff top is two words I think not one.
All and all though this piece has merit and style not to mention a chill to it the somewhat sits at the top of your spine trickling down with eerie affect.
What I'm trying to say is good job with the chill.