Hi Tim, successive layers of white won't get you where you want to be (I know it's not quite what you did but it's how the end result looks to me).
Black basecoat.
Heavy drybrush Black 50/50 Codex Grey (or any other mid tone colour).
Drybrush Codex Grey (if you cover all the previous layer you've been too heavy handed).
Light drybrush Codex Grey 50/50 Bleached Bone.
Feather drybrush on upper areas only with Bleached Bone/Skull White.
Wash.
You need the gradation (?) of the colour through the layers. Successively lighter coats of the same colour won't allow enough black to show through from the basecoat.
On this guy, a Badab Black wash should go on, it's a good time to get to see how "magical" the effect is. Some places will be far better defined & shaped, others will still be frustratingly vague (teeth). If you're using watered down paint add a teensy bit of washing-up liquid to act as a surface tension breaker. When the wash has dried, inspect the mini for tidemarks & paint more wash colour into those recesses!
Bestial Brown is quite orange, I'd suggest stirring a bit of black in to darken it (or dark green/blue).
As far as blasting through loads of Skeletons with drybrushing goes, well, yep, that's it! You've done the basics, now repeat on 250 more figures

Next let's see some controlled brushwork on the axe & shield. Nice neat basecoats and a bit or darklining should do the trick :good:
Cheers, B.
PS Moldline on underside of axe blade? I hate it when people point them out to me. Stupid, stupid moldlines! If you paint on your metals it shouldn't show, if you drybrush it will
