Creating depth of water. Interface above/ under the water with different edge and color.
. Interface can create different image from a normal picture.
Find the color and edge difference, blocking with big brush stroke, creating the interface in between. It is just like throwing 6 balls (concepts) into the air, when holding 2 balls on hand, still need to watch other 4 balls in the air.
It is definitely difficult, but learnable , and the dialog in the painting is readable.