Nose practice, looks a bit dodgy XD More
Eyes by sharpie91 on deviantART
Draw Hair by =ribkaDory on deviantART (btw, why the woman smiles and the guy is blanko/angry-ish?)
How to Draw Realistic Eyes from the Side Profile View - Step by Step Drawing Tutorial
Always great to see how something is done in illustrator. The eye is extremely detailed and has a lot of texture. Overall a great eye and very realistic.
Tutorial: How to Draw Lips - 3/4 View http://rapidfireart.com/2016/10/07/how-to-draw-lips-from-the-34-view/
Parts of the face
Lips are the hardest body part to draw