Looks like the brick is ready for some grime and junk.
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Odorless turpentine and oil paint wash ,
When dry..... i clean the wash off that is left on the bricks ,and seal it with Acrylic Matt varnish.
The dock looks great Piet . Have you tried using pastel chalks to add to the greens ? You could also randomly glob cyno or other glue to give dimension to the alga sea growths , raised look , to be painted green .