zBrush Project - One-Eye

I wanted to make a character purely from fiction, so I choose the character "One-Eye" from the book series "The Black Company" by Glen Cook. The character is a battle hardened companion, so I'm trying to go for an aged look. The character in the book is in his late 100's, so I'm trying to do all I can to age accordingly. The skin has to tuck close to the skull and around the neck is stringy and loose, very hard to mold onto a mesh.

Day 1-

Day 2-

Day 3 -

Day 4 - FINAL