Wow !! Shadows are really amazing ! what pencils did you use for your drawing ? Maybe the shadow on the face ( next to the ear ) can be work again... hum I don't know how to say but it's so dark or maybe you could have extend it to the jaw and the ear, but it's just my opinion. I think the breast is a little too high but very a little. I think ( again \o/ ) the space between the mouth and the nose is maybe a little so big. The hair are really awesome ! this my nemesis when I draw ^^ Then I'm fascinate by the lightness of each fallen hair strands. And the expression of the face is very expressive ( sorry for my bad vocabulary in english )
good luck for your next drawings, I hope my mess is useful and sorry for my bad english -_-"