Good capture of the face

I think you rendered the face really well and in color to which is a bonus!

To improve I'd say use less line, because it is crippling your already mature style.
Also, try to clean up some of the fine details like the lines of the hair overlapping the line that defines the hat. Once again those lines can be a problem, where if that area was all values i'd be some Da Vinci caliber stuff.

Also the earings are kind of a line messes, really takes away from the picture as a whole.

Otherwise it's a very acurate and colorful rendering of the face!