Great work on the hands. They look chunky like they have volume. Also like the way you did the skin tones.

The hair does feel a little flat despite the nice addition of the hand shadow on the head. I like how you changed the original lightsource to be in front of the person. Since the hair has volume and wraps around the head (sphere), there should be some shadow on the sides and especially on hairs approaching the backside of the head. Highlights would also be nice but aren't necessary.

Great work :)