You left out the other kinds of curls. There are a lot. And to be honest, the curls you drew aren't even really curls. I mean, it was like 95% wave and at the tips it curled up a little. Real curls start closer to the roots and then it's all uneven and fucked up, or starts right at the roots and almost is an afro but the curls are bigger and it's not mega poofy.
Everyone draws them differently. This is just my way of drawing different hair types, and I'm sure if it's not realistic enough or not what someone is looking for, they'll just browse on until they find it. My style leans more toward comic books than photorealism. Better luck next time in finding what you're looking for.