First note I'm going to make is that I really didn't do much in the way of edge highlighting on the red armour. I think next time I'll add a little - not much, but enough to make the edges stand out some. The edge highlight can easily be changed to match how dark or light the surrounding area is: Mephiston Red for the darker areas, Evil Sunz Scarlet for mid-range, and Wild Rider Red for the lighter areas. This will definitely take more time, but I think it would be worth it. Without this, the armour just doesn't stand out as much as I would like.
The rope has a thin layer of Ushabti Bone over it, just because it was too yellow before. Perhaps it still is. I may look into rope more in future.
Incubi Darkness for some of the rear cabling, with a wash of Nuln Oil. I didn't want anything fancy for those cables, feeling it would distract from the rest of model if I made them too bright, or even too dark.
The rear fuel tanks are golden/brass, as with the flamer cowling, just because silver would have been too boring. Perhaps it brings too much focus to then when viewed from behind, but that's ok.
Corax Black is my new favourite base paint for weapons. It's ever so slightly grey, which allows Eshin Grey to highlight against it much easier, and Dawnstone for edging. Nuln Oil, or even the more traditional black thinned down, then gives shading as appropriate. The slight hint of grey just gives something to work from; pure black or white give almost nothing to work from.
The Sergeant has a blood vial attached on the left pauldron, so I figured the best colour to use would be Blood for the Blood God. It's a deep red with a gloss finish, so fairly ideal for this purpose. A little Hoeth Blue parallel to the ground to give the impression of a liquid in a jar, some Carroburg Crimson wash, spot white reflections, and finally 'Ardcoat to restore the gloss. It looks to work rather well, so I'll likely repeat that for future vials.
Not much else to say really. Everything was based off prior work, and going back through these posts saved me a lot of effort in figuring out what I previously done.
-- silly painter.