Following Mediocre Hobbies here.

Base layers

1. Horse body in Skeleton Horde
2. Cloth on horse and rider in Plaguebearer Flesh
3. Snakebite Leather on tail, mane and hoof hair of horse
4. Ratling Grime on ropes
5. Horse reins and straps in Gore-grunta Fur
6. Garaghak's Sewer on wooden shield and staff parts
7. Volupus Pink on shaft on wraps of sword hilt and scythe, also mushroom cap
8. Oily Steel on metal chainmail and other buckles, chest plate, etc
9. Balthasar Gold of shield trim, nurgle shield symbold, bells, shoulder pads, face plate
10. Basilicanum Grey on stone base
11. Ork Flesh on rock moss and mushrooms
12. Wash full figure in Mortarion Grime

Base

1. Add Stirland Battlemire to the ground
2. Add some tufts

Details

1. Layer up the green cloth in Death Guard Green
2. Shade horse skin in Carroburg Crimson
3. Skin highlights in Kislev Flesh
4. Put Volupus Pink on skin sores
5. Shade skin again in Reikland Fleshshade
6. Light scratch highlights on silver/brass in Oily Steel
7. Light drybrush of Ivory on hair