The cut for your fine to medium hair with ringlet curls is:

Long hair with long layers.

Why you should try it: According to Mancuso, the curlier the hair, the longer the layers should be. AnnaLynne McCord shows how layers define her curls and the razored ends give off a rocker vibe. To get the look, see Mancuso's tips:

Step 1: Apply a smoothing serum like Pureology SuperSmooth Smoothing Elixir, $18, and comb the middle section of your hair back.
Step 2: Blow dry hair with a diffuser, using your fingers to pull hair gently to preserve the natural texture as much as possible.
Step 3: Apply a curl cream to define pieces in the front and combat frizz that resulted from drying.
Step 4: Take a curling iron like Remington T Studio Pearl Ceramic Professional Styling Wand, $29.99, and identify some key spots around your face that you want to dress up, says Mancuso. "Curling just a few sections of hair will give you a nice mix of spirals and softness."