A darker, less cartoon-like scheme for 40K Death Guard

Armour

1. Prime the model with Vallejo Black Surface Primer.
2. Paint entire model with Castellan Green
3. Apply Loren Forest Either as zenithal using airbrush or roughly with a brush.
4. Wash with Athonian Camoshade
5. Drybrush Armour with Nurgling Green :
6. Re-shade armour with Athonian Camoshade , keeping only to the recesses
7. Glaze all the armour with Waywatcher Green
8. Apply a heavy drybrush of Krieg Khaki to the armour
9. Shade the craters in the armour with Nuln Oil to create deep shadow.
10. Add a final manually applied edge highlight of Krieg Khaki

Bronze & Brass

1. Basecoat all bronze/brass areas with Balthasar Gold
2. Highlight bronze areas with Liberator Gold
3. Wash bronze areas with 50:50 mix of Agrax Earthshade and Reikland Fleshshade
4. Highlight the very edges of bronze with Stormhost Silver
5. For Brass bells, base with Vallejo Old Gold
6. Shade the brass bells with Nuln Oil concentrating on a build-up on the inside to create deep shadow and also on the outside on the curve/flare of the bell.
7. Add a final highlight to the bell with Stormhost Silver

Tentacles & Tubes

1. Base coat with Rakarth Flesh
2. Shade the recesses with Druchii Violet
3. Apply a 50:50 mix of Carroburg Crimson and Lahmian Medium over all the tentacle/tube.
4. Paint any exposed tubing under the flesh with Abaddon Black then highlight the ridges in the black area with Leadbelcher
5. Highlight any raised areas (and areas around the exposed underpiping) with Flayed One Flesh
6. Add a spot of Yriel Yellow to any pimples/boils.
7. (Optional): Add a thin layer of Nurgles Rot to emulate the look of slime.