Green Undersuit

1. Base with a Dark Green Lupercal Green
2. Wash the shadows with Nuln Oil
3. Clean up with Lupercal Green & Highlight with Sons of Horus Green
4. Create a even brighter highlight with Sons of Horus Green and a light colour, I used Pale Yellow to just add a small lightness, maybe a 80/20 mix.

Red Panels

1. Base coat with a dark red Berserker Red
2. Paint most of the panels again with a brighter red, keep the shadows in the places shadows will be Sanguine Scarlet
3. Paint the tops of the panels with a super bright red, less is more Demon Red you can use it for the edge highlights on the panels

Armour Trim

1. Overlord Brass and Reikland Fleshshade not much to say here.