if you have thick hair like i do probably not much. Sorry. But hair spray is always a good idea and try getting a tighter curl by not brushing it out after your done, it will fall or wave eventually but it will be a bit longer hold. Oh and avoid getting your hair wet like with rain or fog, that is instant lack of body without a doubt.
You can spray your hair using Hair Tonic, which will help to dampen it without making it frizz. You can also use a volumizing shampoo and conditioner like Pravana, which will leave your hair a bit lighter and be able to sustain the curls for long.