Character Customization
Info provided by NPC99
Related forum post: How to creat a new race and use my new face model
Character Code
Excel spreadsheet by NPC99: Link
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Male Hair
Beards
NPC99: TW sharing the 15th digit between hair styles and beards wasn't a clever plan for making face-codes moddable IMO.
Female Hair
Female hair is determined by 15th and 16th digits of the 128 digit face/body keys. Digits are in hex - max 16 possibilities for one digit, forcing use of two digits to cover all options.
Female Tattoos
Skin Colors
NPC99: I presume there are a full 16 colours (hex) for each of the four 3rd digit (blue) options even though the character creater only samples 6 of each. The ranges demonstrate how the sequences work.