I like the shading

The proportions seem a little off though. In the eyes, for instance, the near one is significantly larger than the rear, and the far cheek looks enlarged. Lots of promise though.

well ok

um certainly a lot of room for expansion of skills and stuff
just a few things I wanna point out:
-the overall shading was pretty decent
-you may want to define your lines a bit more
(however that actually doesn't hold in the long run since well real people don't really have outlines now do they?...but that depends really on what you wanna achieve)
-anyways back on topic, the eyes and brow seem just a tiny bit too high
-lips were done quiet well, but like before you may want to better define most of the features
-also the neck seems a bit thick (although the shape is right)
-and well shoulder needs to be somewhat wider
-finally the frame of the head and face(eyes, nose, mouth...) are a bit off
<perhaps rotate the "face" 5 degrees counterclockwise>

-hope this helps