Firstly, faces are so very hard to do. I think you've done a good job here. you actually have the outlines of the shapes done quite nicely. I cannot attest to accuracy, since I do not see the photo of the person to compare to. But it looks correct anatomically.
you can achieve more 3D effect by shading out the eye sockest a bit more and the sides of the nose. Look carefully at the photo again.
also, the lower lips often kind of fade into the facial skin at parts, so softening that line (erase the line that is outlining the lips and just use shading to define the change from lip to facail skin) will help.
In fact, don't use LINE to define everything. you can define things with shading, completely nixing any kind of outline.
her Iris seems rather light in comparison to the pupil. is she very light blue eyed? it makes her kind of "eerie" looking. I'd darken the iris.
even the eyeball can have shading to make it more "orblike".
hope this helps. YOu have some talent, it's obvious!