Shade the areas that will be the water and the sand, leaving a white space between them.
Use slightly darker colors to add texture to the water and sand.
Use a white gel pen or acrylic marker to draw ovals of various sizes on top of the water to create seafoam.
Use a dark teal to line the bottom edges of the foam bubbles. Add speckles to the foam in white.
Use yellow and purple to highlight and lowlight the bubbles.
Use a white gel pen or acrylic marker to add star shapes for sparkle!