HOW TO PAINT GRIMDARK!
1) research "Kingdom of Naples Napoleonic soldiers" then do NOT use any of those colors in your uniform
2) paint everything gray with zenithal shading, add gunmetal or bronze in light coats as needed
3) go nuts with black/rust/verdigris washes
4) drybrush fur, add little scratches to leather
5) add a few glowing red or blue lights as needed
6) spatter everything with brown modge podge from your base, so steps 1-5 probably don't matter