Pump up the volume. 

For oomphy, tousled strands, try this trick from Nathaniel Hawkins, a celeb hairstylist who has worked with the Olsen twins: When you're finished blow-drying your hair, switch to the cool setting, flip your head over, and aim the nozzle around randomly for a few minutes. "This creates pockets of air between your locks so they look extra full," he says.