How to curl my hair to make my hair look 'tousled', loose, and curly like this photo with straight hair?

Curl with a smaller iron, and then sort of run your fingers through, flip your head upside down and give a little shake. Don't use a paddle brush because that with just make it go POOOOF! a wide toothed comb like a pick might work if your run it through a couple spots. Use a de-frizzer before straightening and a thermal protectant because thats a LOT of heat