A quick guide to painting the Eye of Horus on Chaos Marines.

1. Basecoat Mephiston Red . You can apply a thinned amount of this into the crevices if you want it to look like a glow.
2. Paint 2/3rds Evil Sunz Scarlet , running a bit more into the recesses as above.
3. Paint just over half with Wild Rider Red
4. Paint just under half Troll Slayer Orange . This has a gradient of red to orange now towards the bottom.
5. Paint a black line with Black Templar (I find this easier to control out of the pot, but Abaddon Black watered down would work)
6. Thicken the line to a slightly rounded triangle, or an oval for the Sauron style eye.
7. Paint a thick line of Fire Dragon Bright around the black line. Add dots at the side points of the eye.
8. Paint a mix of Fire Dragon Bright and Yriel Yellow inside the orange layer, next to the black line. Dot inside the side dots as previous.
9. Add a very fine Yriel Yellow line.
10. Use White Scar to add a dot inside the black line as a reflection.
11. Coat the whole thing with a medium as the reds all have different finishes.