Red Armour

1. Prime black
2. Base coat using stippling/drybrush Dark Crimson don't worry that it's shiny
3. Stipple/drybrush Red Oxide
4. Stipple Bold Pyrrole Red as highlights, then do a second round of this

Black

1. Basecoat black armour, treads, and weapons Black
2. Black armour only: stipple Charcoal
3. Highlight black armour with German Grey

Metallics

1. Drybrush treads with Jet Exhaust this is a thin paint but you can do this, just takes more drying of the brush
2. Paint weapons/exhaust Jet Exhaust
3. Highlight weapons with Silver
4. Paint some metal bits with Bronze
5. Highlight above with Light Bronze

Window slits

1. Basecoat Dark Grey Blue
2. Paint 1 or 2 corners Sky Blue

Green Lenses

1. Basecoat Green
2. Paint dot with Bright Green

Yellow Lenses

1. Basecoat Warm Yellow
2. Highlight Golden Yellow

Finishing steps

1. Gloss coat model
2. Payne's grey oil wash, water it down a lot so you dont need to remove much
3. Matte coat model