Shade with Guilliman Flesh , then deep shade Cryptek Armourshade Gloss
Highlight with Runelord Brass , Canoptek Alloy and a final dot of Silver RLM01 Metallic
The virdigris is very thin Lupercal Green , just build up in layers. Feel free to add a bit of Nihilakh Oxide or Baharroth Blue (thin!) on the most worn parts