Amazing.
I love this! I especially love the young Link, Zelda, Shiek, Skullkid, and Shadow Link redesigns. Your attention to detail on each one is surprisingly good, and how much of your own style and personality is placed into the characters is awesome.
One complaint, though: Shiek masquerades as a man. The outfit you have her in now is too feminine and is a dead giveaway as to her true gender. I love the way it looks, and accuracy may not have been what you were aiming for, but it's just a little nitpick of mine.