Start with a nude acrylic over the whole nail, once set smooth and refine shape.
Mix 1 part Azure seas pigment with 3 parts clear acrylic, pick up a large bead of your blue acrylic and create a wave shape.
While acrylic is still wet dip your brush in to mint metallic super fine glitter and dab a small amount in lines on the wave. Then water down some white acrylic paint and paint some fine lines through the wave.
Top coat the nude with a Matte top coat and the wave with a shiny top coat and cure.