What I do for blonde hair is:
Basecoat with a yellow and bone mix. I use Vallejo's Mate Yellow and Pale Sand, which are similar to Sunburst Yellow and Bleched Bone from GW. The mix is 60-40 or so.
Next, I give it a fairly diluted Flesh (Chestnut or Brown can work too) ink wash.
Finally, I give it a Yellow & Bone (around 50-50) mix drybrush.
Try it and see how it works for you, and use different proportions. I hope it works, but then I also hope that a more able painter will help you better
