Thoughts from first attempt at a face unwrap -
This tutorial really helped - https://www.youtube.com/watch?v=jIhZ10TOLtI
3 selections, edge, point, and polygon faces, then creating a material, tagging to Generate UV Map, then Showing UV mesh, projection Frontal then relaxing with ABF with Pin Point Selection and Cut Selected Edges turned ON, Relax UV Pin Border Points and Pin to Neighbors off. It has the proper split at the scalp. Here's my first one without manually pushing points around, and I'm already very happy with the result: