Reference:

I wanted to try a different style of shading in the hair, one which looked different than my other skins of Timeskip Eren, since I wasn't too happy with how the hair shading turned out.
Earlier I saw a skin of Eren in the marley uniform by a well-known artist,
Aquarelles and there was something that really got my attention and that is the hair shading. I wanted to try and make a hair shading that looked similar to that of their skin without completely plagiarizing their work on the skin's hair which I really liked.
Be sure to check out their
skin which gave me some inspiration for this skin, I wasn't planning on making Eren with marley gear until I saw their take on this skin.
(Aquarelles, if you're reading this and want me to take this down then that's totally fine. My intention was not to plagiarize your work in any way or under no circumstance)
I love how you did the hair and gave it a lifelike look, good job! β€οΈ
Really good work on yours also :D