Just as in the above hairstyle, you don't wash the hair everyday as dirty hair is easier to manage. Get the hair damp and use salt water in a spray to bring out the wavy curls. Salt spray will do amazing things to your hair.
According to the salons, everyone's hair has some natural waves and patterns and this will bring this out and intensify it. This style is so hot, just look at the sexy sirens that sport it, Jessica Alba and Shakira. They wear this style so very well. Add a simple locket or amulet to make it that much hotter. So try spritzing or spraying a little salt water on already damp hair, scrunch it and then let it air dry. Scrunching it while it is wet will give it volume and randomness. Since most hair has some sort of natural wave, the salt spray will bring it out.