thanks again guys for all your encouragement and feedback, its much appreciated
As you can see i have dry brushed him just like the orcs (Codex, Fortress and Skull White) sorry i didn't take a picture of his face before painting.
Skin;
Watered down Tallarn Flesh was build up on the dry brush foundation. placing the brush where the skin meets his hair and sweeping towards his nose, cheeks and forehead respectfully.
Subsequent layers of Tallarn where applied more to his forehead, nose, cheeks and chin...basically all the highlight areas, be mindful that this doesn't completely negate the skull white underneath.
Just keep in mind not to load the brush with too much water or paint, in fact you want as little as possible, better yet have near enough to nothing on the brush. It will look messy and bad at first, but as you layer up the Tallarn it will blend the black, grey's and white together.
I cant be sure of the exact mix of water to paint but when you apply the first layer it should be near enough unnoticeable, at about the 3rd or 4th the effect should become noticeable. I'd say i used around 6 layers on his skin and hair.
Hair;
Watered Down Desert Yellow all over, let the dry brushing underneath do all the work.
Shaded the recess areas of the hair with some watered down Graveyard Earth which was also used to shade where his skin meets his hair and under his eyes. To this mix I added some watered down Scorched Brown (roughly 60/40) and applied it to the same areas and underneath his bottom lip.
It may take just as long to paint using thin layers as it would doing it in the traditional style of mid tones, highlights and shades but with this style you only have to paint the mid tones and shaded areas, as you paint darker the highlights come out by themselves. Also the transition between the different tones should appear more seaming-less. As long as you can stay between the lines so to speak its all good.