Stage 4: Having painted all of the water and sand to a finished state it still did not look entirely convincing - it was hard to 'read' the transparency of the water, particularly in the foreground. I noticed in some photographs I had taken that there were scattered fragments of dark seaweed, mostly in the water between the ridges of sand, so perhaps it was these that gave the idea of transparency in the water. I painted some in and suddenly the effect I had been searching for was achieved. I also added some worm casts.