Yesterday I managed to finish these ghosts. The models are from GW and were part of one of these boardgames you can buy in German drugstores (Müller) and book shops.
Say what you want about the Stormcasts and the Age of Sigmar aesthetics, but these models are brilliant!
I painted them extremely simple: spray basecoat (wraithbone something) and a single layer of contrast paint. The bases were also painted with contrast paints, then a few toppings were glued on them (to harmonize them with the other bases, but also to hide the skulls…even here, just too many).