I love the depth and texture you've captured in this piece. It definitely serves as an example of how to draw realistic, dynamic long hair in different styles. My favourite would be the top left one (though that could just be my personal bias towards long curly hair). A couple criticisms: some of the strokes in the top right one are a bit short, and seem unconnected with the rest of the hair. For the middle (left?) bottom one, not sure if you're trying to draw a twist or a braid. Overall, good work though. I could definitely use this as a reference for drawing hair.