By request, I painted a simple grimdark Shadowkeeper with a bit of a slapchop method. It's easy to follow along with and you can paint a great looking army ...

This is how I painted my own Custodes army in a grimdark style. Bronze is a great metal to paint as it weathers and get tarnished.

This is an easy to follow miniature painting tutorial. Even if you are a relative beginner you can get a result close to this to make your army look great.