I painted Angron recently and I went into quite a lot of detail to show exactly how I did it. I've made a multi part video series showing how to paint each of the main sections of Angron. There will be a fifth video showing how to do the cloak, not sure when that will appear, I haven't quite finished it yet.
Part I focuses on the green tassles, the red armour plating and the gold.
Part II goes in depth on how to tackle the more complex golden surfaces.
Part III shows how I painted his face and also gives an overview on how I tackle OSL effects.
I also made a colour guide video for his detailed base.