I've never mastered drawing "realism" or anything like that. But for me, curly hair the way I do it is actually sometimes easier than straight or wavy hair. I really only draw the ENDS of the curls, and layer those ends in rough half-circles next to and interlacing with each other like you would do with bird feathers. If I figure out how to post an image into a message on the forum, I'll post an example (hobbit) with curly, curly hair I drew. Falcon has curly hair in my Wayfarer's album, but it's not as extreme an example, a bit more subtle.