Here is how I painted Judge Dredd's Lawmaster miniature, from the expansion to the Judge Dredd game from Warlord Games.
Black Bike Chassis
Basecoat with a pure Black . Whilst I used a Vallejo paint, there is no reason you couldn't use Abaddon Black .
Add a chunky edge highlights with a mix of Dark Reaper , Kantor Blue & Black , mixed in equal amounts.
Highlight with Dark Reaper , make these highlights finer than the previous stage, but allow yourself space to make the next stage finer.
Mix Dark Reaper and Deepkin Flesh , then use this for fine highlights.
Selectively highlight with Celestra Grey .
Finally add specular highlights of a pure White .
Basecoat with Leadbelcher .
Wash with Nuln Oil .
Take some :contrast medium and add in some Nuln Oil and Wyldwood . Now use this mix to shade the recesses and glaze for a little extra dirty look on the metal. Do a couple of passes to enrich it and ansure you have a variety of tones.
Add chunky highlights with Ironbreaker .
Add fine highlights with Vallejo Model Air Silver (or Stormhost Silver ).
Basecoat in Corax White .
Paint a smaller section within this of White Scar (or another pure white). This is mean to represent a direct glow from the bulb.
Paint the whole thing with :a 1:1 mix of Aethermatic Blue and Contrast Medium . Drag the brush towards the edges, away from the "light source". Glaze with this mix a few times if needed.
Now glaze toward the bulb with your White Scar , bringing back the brightness. You could even paint a very small path in the centre, if you wanted.
Basecoat with Mephiston Red .
Soft shade the recesses with thin Khorne Red .
Mix a little Abaddon Black into your Khorne Red and do a more targeted recess shade.
Chunky highlights with Evil Sunz Scarlet .
Fine highlights with Squig Orange .
Now mix some Ice Yellow (or Dorn Yellow ) into your Squig Orange and highlight smaller and smaller. I did two passes, making the second one a specular highlight of almost pure Ice Yellow .
Basecoat with Retributor Armour .
Wash with Gore-grunta Fur , thinned with an equal amount of water. Try to pull this towards the deepest recesses and feel free to do a couple of passes/glazes to build up colour where needed.
Darken the shading and recesses with some Cygor Brown , covering less area than in the last step.
Tidy up the gold with Retributor Armour again, bringing back the colour where needed.
Mix some Silver RLM01 Metallic into your Retributor Armour (around 1:1 and some highlights.
Add much smaller highlights with Silver RLM01 Metallic .
Basecoat with Abaddon Black .
Drybrush heavily with Abaddon Black and Skavenblight Dinge , mixed 1:1.
Drybrush again with just Skavenblight Dinge , apply the paint more lightly.
Aelectively highlight edges with Stormvermin Fur .