Here's my test subject.
Here's what I've done so far:
Bone:
armypainter black undercoat
ushabti bone basecoat
screaming skull basecoat, completely covering ushabti bone
seriphim sephia applied to recesses in bone
Armor:
armypainter black undercoat
eshin grey line highlights
for the bone I still plan on touching up the seriphim sephia with screaming skull, and then some line highlights with white. Not sure what do for the helmet though, either a dry brush of white or maybe I'll try my first wet blend
The black on the arms/ gun still need to be highlighted in eshin grey. I'm considering doing some very fine line highlights of a lighter grey on the most raised edges. I'm not sure what to do about the middle gem-thing with the raised eldar character on it either, maybe just putting some 'ard coat on it to make it shiny?
I'm also going to be doing the gems in a mix of red-orange and green gems like I did on my wave serpent. Probably green gems on the gun and the bone colored elbow of the wraithguard. Red-orange everywhere else and and maybe on the ammo-tanks (round things) attached to the gun