space wolf skin

Good day everyone, I am starting another great company for my space wolves and I am frying to follow the fluff this time so I need to paint my wolves(marines) skin a grey ish color but I am having trouble coming up with a paint mixture so I ask if anyone can help me that would be greatly welcome and thanks

your gonna have to scroll a long way down before he gets to the face (last thing he does before the bases). this is the palest space wolf face tutorial i could find online. anything greyer and it looks like comic-book vampire/zombie with alot of blues and greys.
http://www.heresy-online.net/forums/showthread.php?t=52843

edit: also found this one: http://apoca6.blogspot.ca/2011/05/painting-faces-my-way.html