General scheme for Iron Warriors, updated to be brighter and read better from a distance (no more formless blobs of dark metal)

Basecoats

1. Prime with Leadbelcher
2. Base model with Leadbelcher in any parts missed
3. Base armor joints, gun casings, and shoulderpad flats in Black Legion
4. Base trim in Retributor Armour
5. Base cloth and "real" horns in Steel Legion Drab
6. Base soft daemon parts and tassels in Daemonette Hide
7. Base hard daemon parts in Stegadon Scale Green
8. Base fur in Mechanicus Standard Grey
9. Base leather belts and holsters with Dryad Bark
10. Base skulls with Zandri Dust

Shades

1. Shade armor in Targor Rageshade and deepest recesses with Nuln Oil
2. Shade bones, "real horns", cloth, leather belts/holsters, and fur with Agrax Earthshade
3. Shade metal weapon bits with Agrax Earthshade
4. Shade daemon flesh with Druchii Violet
5. Shade tassels with Luxion Purple

Layer

1. Layer cloth and "real horns" with Steel Legion Drab leaving deepest recesses
2. Layer areas to be done in hazard stripes with Averland Sunset then layer stripes with Abaddon Black
3. Layer skulls, bones, and small cloth strips with Ushabti Bone
4. Layer hard daemon parts with Sotek Green then 50/50 Sotek Green and Temple Guard Blue then straight Temple Guard Blue
5. Layer eye lenses in Temple Guard Blue

Highlight

1. Highlight soft daemon parts with Warpfiend Grey and then Slaanesh Grey
2. Highlight hard daemon parts with Baharroth Blue
3. Highlight fur with Stormvermin Fur and then Administratum Grey
4. Highlight tassels with Genestealer Purple
5. Highlight metal parts with Leadbelcher then Stormhost Silver
6. Highlight gold trim with Liberator Gold
7. Highlight cloth with Baneblade Brown
8. Highlight skulls and bones with Screaming Skull
9. Highlight "real horns" with Baneblade Brown then Screaming Skull
10. Highlight hazard stripes with Ushabti Bone on yellow and Thunderhawk Blue on black
11. Highlight gun casing with Thunderhawk Blue
12. Highlight leather and holsters with Gorthor Brown
13. Pick out little details like eyes in parts in either Averland Sunset and Abaddon Black for pupil, or else pure Temple Guard Blue