The scene is a hyper idealized representation of a little water runoff "cove" I remember from childhood adventures. The noise of the tiny rivulet of water back under the grass always seemed to invite exploration - but the only way to get back into the cove was thru the water - and I was too chicken to step in and get soaked.
Some experimentation with a very liquid look to vector based presets
These were meant to simulate the gradated tonal look of sumi ink paint strokes and water application to existing strokes
cd-vect_sumi-longsoft series