The shading, hair and lineart are beautiful. You are a talented person in my opinion. The only one thing I want to ask is: How does one draw hai like that? How much time did you spend on it? Oh wait, that's two things.
The drawings themselves usually take about 2-4 hours, with the hair definitely taking the longest of the whole thing. As for how I draw the hair, I can't really explain it. It's basically just drawing a ton of thin lines, and making it darker/lighter where I need it to be.