Frank,
I only use Vallejo paints for faces with Citadel washes. I use a basic flesh mix (50/50 sunny skin tone and Salmon Rose), then lighten it up and thin for the highlights. Then for figures like this that re not really going head to head with other figures, I then use the Citadel Ogryn Flesh wash (or whatever it is called today) to give the depth.
The washes dry matt so they are just fantastic for this kind of work.
Thanks all for the encouraging comments