From the artists site:

"It is the broken, worn, incomplete shells that provide inspiration. The shell that inspired the painting above has little pock marks in the surface where bugs have gnawed at it and faded brown lines that dash across the surface. The composition sketch in black pen has scribbled notes reminding me what the work was about. The compositional drawings of shells I produce while planning an artwork are not overly detailed, but depict the basic structure of the work; the placement of the shell, landscape, and the main water lines extending out from the curves of the shell. "