Evoking the end

[TranquillityBase]

On the knotted beach 
castles built-
smoothed over 
into glass,
thin water
swept sea foam
into ribcages,
and the misty white sun
stretched out like an eye,
draining all color
from the world.

I'm not keen on "knotted" beach for some reason.

What about "Beach castles built-" as a first line.

I'd also suggest something more than "thin water"...or delete it and say "sea foam swept...."

The rest is very good in my reading.