Wow thank you for actually saying so.
Lets start with the realism. Lines are too hard in soem places but particularly around the lips, and they feel like they're sorta .. Mr Potato-headed onto her face. Also when u do mouths, don't pay so much attention to the details in the shape of the teeth. No one likes to know just how crooked their incisors may be, and if u can imply teeth without drawing each idevidual outline you'll both flatter the subject more, and save yourself some unnesecary work. Eyes are shaped well but i think the larges problem with the face as a whole is that you over-render some areas and the areas u leave to line art look too harsh.
Th biggest issue here is that the hair is all kinds of o_O around the forhead. That is another areas where details are best kept sparse, and in general u should never render hair as a bunch of pencil lines.
Not a bad base but needs some more polishing. Also i may want to play with line weight some more.
And then we come to the zelda stuff... This bothers me because i have a funny feeling you may have used Illustrator for the line art. I'll leave my thoughts on this allone until u answer this question: Did u use illustrator or a vector art program to do the digital line art?