-be conservative with lines on surfaces (the nose, mainly) - don't lay them on heavy like with your outlines.
-You can vary the weight of your outlines to suggest volume.
-you've ended her head about where her hairline shoud be - which is common, but will wreck your volumes once you get to drawing hair.
-eyes are pretty deeply set into the head, so shadows under the eyes gives a lot of realness
-unless the eyes are especially wide open, your iris usually extends all the way from one eyelid to the other.
-lips are only slightly darker than the skin around (unless heavy lipstick) and top lip is darker than the lower.
- i can't draw ears, either. use reference, and you'll be better off than me.
that one is important:
use a photo for reference, observe distance between things relative to other things. You'll learn more stuff of use than anything I could say.