I used a pretty simple scheme for the skin.
I basecoated with Space Wolves Grey, washed it heavily with Ogryn Flesh, highlighted with Space Wolves Grey again then did a thin extreme highlight with Skull White. As a Chapter Master/Captain, Edithae is one of the oldest members of the Chapter, hence the white highlights.
My younger Raven Guard use a different scheme, Fortress Grey washed with Ogryn Flesh then highlighted with Fortress Grey again. No white highlight.
The Raven Guard are described in the fluff as turning albino with black hair and eyes as they age due to a side effect of their Primarch's geneseed (Corax was albino).
My next
40K project (after I finish a
LOTR Arnor army for a tournament in April) will be a Vanguard Veteran squad (new plastic box) to use as bodyguards for Edithae. They'll be magnetised too so the weapons will be interchangeable.