Another portrait practice - playing with shadows

So I have always stayed away from sketching shadows because I find them really hard! And the faces tend to end up looking like they have "dirt" on their faces..*winks* But I decided to give it a go. Props to you if you can identify who this person is.  Because she couldn't recognize herself in the drawing but when I showed her the reference photo, she said  it looked like the photos! *LOL*