On your first one,
You have the lighting on top which seems customary for all pieces with anime characters in them. What impresses me though is the depth and flow. The use of vector shapes and threads while going along with the flow of the hair! A nice idea, and you worked well with it, I must say. Hell even the colors seem like they're moving!
You've created minimal depth by using those diagonal vector lines and erasing out the edges which I really do like.
Also, you mixed the warms and cools in such a neat way! Overall, I give this a 6/10 even though it still looks a bit like a signature to me~ xD