I should have a "normal" 25mm figure next to this to give an impression of the size - I've painted Ogres which are smaller! The Centurion is mounted on a 40mm base.
I was made aware that there was a loose colour scheme to adhere to when painting this figure. As far as I could tell, that involved including some purple on the model.
Well, that saves me having to think too much....
After spraying the model black and giving it a couple of coats of nice watery black to cover any missed bits, I drybrushed his mail shirt with Chainmail paint (all the paints I use are Citadel acrylics), then gave it a watered-down black inkwash.
The metal bands and 'medallions' are first painted in Scorched Brown, then in Dwarf Bronze, and finally Shining Gold. This is pretty much how I did all gold or bronze on this figure - adding different consistencies of Brown or Chestnut Ink to create diversity.
The cloak is drybrushed Scorched Brown, followed by successive lighter brown drybrushes going to Bleached Bone at the hem. I gave it a watered-down brown inkwash to neaten it up.