A basic approach for brown skaven.

1. Undercoat with a grey, zenith with a light grey, drybrush with a white.
2. Skin is Guilliman Flesh fur is Gore-grunta Fur armour and metal gets Black Templar cloth is Flesh Tearers Red warpstone is Karandras Green leather is Garaghak's Sewer mouth and tail is Volupus Pink base was done with Basilicanum Grey
3. Metallics are Army Painter Heavy Metal for the silver and Balthasar Gold for the bronze.
4. Wash with Agrax Earthshade or Targor Rageshade
5. Flesh is highlighted with layers of thinned Beige Red
6. Black Armor is highlighted with First edge highlight is a 2:1 mix of Thunderhawk Blue and Incubi Darkness Second highlight if 1:1 Thunderhawk Blue and Fenrisian Grey