I did notice that you drew a scalp, and then added volume on top of it. Which is okay, and often used in anime. But then you drew a parting in the hair, and you drew that partly above the scalp. But the hairline is the place where you see the scalp through the hair, and thus it can never be above the scalp itself. Because of this his head looks really long and weird when you start to colour it, because basically you extended his scalp.
Also, I like your colouring step 6 better than 7/8. Don't use whites for highlighting, build your drawings mostly with shadows. Highlight aren't on the whole hair, only parts of it, hair is still a 'whole thing', not every strand for itself.
Other than that it looks pretty helpful, thanks for making this.