Congratulations on finishing a model. However, you have a lot of anatomical and proportional errors in it and you'll want to study both for your future work. I would suggest, at first anyway, to concentrate on learning the structure of the face. Then, once you feel you've got a grasp on that, move on to doing the upper torso, using reference as you go. Keep at it. Finishing a character is a great achievement but be sure your goal isn't strictly to complete the character but to learn as you do.