Hair Studies
This was a task not included in the block of study I was doing but I wanted to do it before tackling my next portrait study. I drew other reference photos practicing breaking down hair and values. I watched the videos @gregorya linked above and they helped although I definitely still struggle with this.
In pikat's video she talks about getting keeping the overall shape in mind and getting down the "big shadow shapes" first and implying texture by refining shadow shapes.
This image below is from her video tutorial when she is speaking about big shadow shapes.

Hearing all this makes sense but when I look at reference photos to practice doing this myself I am slightly stuck and am thinking "I have no idea where the big shadow shapes are at all and I dont know how to break this down". I definitely need to study values more to get better at this.
Anyway here are the studies, there were a couple more but I deleted them by accident somehow (facial features were quickly traced as I was focused only on the hair for this task):
