Here is the formula I used for my EPIC imperial Fists

Averland Sumset base, Lamenters yellow wash, touch of Seraphim Sepia, and follow up with Yriel Yellow dry brush.  

It’s super fast to paint and in EPIC scale you don’t have to worry too much about being neat.

I normally use Vallejo paints, but I’m pretty pleased with the Citadel colors for the IF, thought not thrilled about the price per pot. :(