It had been a very long time since I had done this much of a patina on a figure, so I had lots of fun on this guy!
I used the Secret Weapon Weathering paints for all of this figure... the bull, the axe, the armor, and so on. They are very flexible, as you can go with a lot of glazing, and yet still use them in an opaque manner.
That element of glazing was very key, as most of the detail areas like the filigree were sculpted into the armor. This meant that the patina would sink down into those areas, and look very natural!
I have used the Secret Weapon paints on a number of my live sessions... everything from tanks to beastmen to Dark Sword figures.