very very very simple and quick process for this guy i got the idea from a post about renegade
IG the guy painted his clothing in a very dusty looking way and i somewhat stole his idea
ok so start off with a pretty thick layer of bestial brown let that dry
2. drybrush snakebite leather over that
3. drybrush bleached bone over that
4. go over all metal with boltgun metal than drybrush tin bitz over that (im not sure if they discontinued tin bitz but i have like 3 pots of it

)
5. do eyes and mouth piece with leech purple including all nurgle symbols
6. water down some goblin green till it is basically only water with a greenish tint and slather that over the model and for a slightly glossy affect (optional)
took about 15 minutes