This creates sculptures made from sand and seashells in a top down view. The sand sculptures are more stylized than realistic (probably not possible to get details like this in real sand!). I was getting good results with weights between 0.9 and 0.7.

To get the blue water and accents, add "blue foaming water" to your prompt. If your results don't look enough like sand sculptures, add "sand sculpture with seashells".