Joy's hair has been the most difficult and time consuming part of her model to create thus far. My initial sculpt was packed with detail; I was trying to make it as realistic as possible, but I found that the intricate and detailed hair distracted from the rest of her model, which is a touch more stylized.
I decided upon a stylized and more minimalistic look for her hair model that will work in conjunction with textures to realize a look that matches her concept art. She will eventually be animated, so it doesn't make sense to spend too many polygons on her hair alone. This ain't Pixar, folks. Have a look at how I created the mesh for her undercut hair style in the video below.