I think it can be imagined like a canvas. The surface of the mass formed by the fine grains on the beach often shows itself like a wide natural canvas. A canvas formed by sea waves, or by sea tides that has the ability to make beach sand have unique reliefs, even sometimes when a beach has heavy and shiny black sand, the tides seem to be able to separate it from colored sand other. Coupled with something on the surface of the sand, it might look like paintings by nature. Or maybe that kind of imagery, it doesn't really fit,😜😁 but what is clear, these pictures are about sand and something on it!
Dead mushrooms
A dead tree buried on the beach in a heap of sand. It was with the mushrooms growing on it.
Shells
Plants and roots, maybe mangrove roots.
A reptile trail
Sand crab
And a structure after shore abrasion
This is my entry for the #monomad challenge