To achieve a realistic look in a wave drawing, pay close attention to the details that make each wave unique, such as the way the light reflects off the water, the movement of the waves, and the subtle shifts in color and texture. Also use different techniques to create depth and dimensionality, such as varying the thickness and direction of my lines, using shading and highlighting to create contrast, and layering different colors to create a sense of complexity. Additionally, try to capture the energy and movement of the waves, which can be challenging but also incredibly rewarding when done successfully!