Try the following:
1) use a white primer
2) undercout the modell with screaming skull
3) shade the reccesses with agrax earthshade
4) wash the whole modell with cassandora yellow
5) layer the modell with a 50/50 mix of averland sunset and yiriel yellow (water the mix down quite alot due to the cassandora wash it is still a solid coat and you won t need more than 1 layer)
6) last step my be some highlights with flash gitz yellow
It is for me the perfect method. Relativly fast to paint with a really solid result .
I will try to post a picture so you can see the result
greez