I like the breakdown of the 'why' here
Learn How to Draw Eyes
How to draw eyes
ArtStation - Old Sculptures, Rafael Grassetti
Zac 1 Legend of the Cryptids / Applibot Inc Marat Ars
Cghub Production Challenge 2012 Entry by Adelben - Adel BENABDALLAH - CGHUB via PinCG.com
Undead Giant concept art by Christian Bravery aka The Brave.