Primed black, then grey primer from above lightly, paint metal leadbelcher, wash entire model nuln oil. Using cotton buds to soak up excess and clean off top areas.
Drybrush metal with necron compound, dot of white in each eyesocket/scope, edge the shoulder pad with mephiston red, then highlight evilsunz scarlet, then highlight wild rider red. Put some fluo green on scopes.
Skin for sergeant was just ratskin flesh, cadian flesh, fleshshade wash, cadian flesh. Plasma coil was white with a guilliman blue glaze.
I forgot the purity seals till the end so those were just baneblade brown followed by screaming skull, and evilsunz washed brown.
Bases were down following a guide in white dwarf.
Basecoat colour primers, washes and drybrushing. Also a black micron pen solves a lot of problems with messing up the white in eye sockets or the red trim going onto the shoulder pad armour.