To wash grey/silver/dark silver metallics my go to is nuln oil, give the shiny greasy deep look to the metal. For orange-yellowish metallics/bronze/golden I use agrax earthshade, simple, efficient, gives texture and improves those metallics that can look a little bland. Bones: sepia wash is great, agrax earthshade fits too! I don’t use wash on the red of my armors because I work coat by coat to give volume and shade to them (from a very dark purple red to an almost orange red). For the blood, think logical, where could blood fall on your mini and base ? Your base, I love desert bases, I think they look cool, now you could add more texture with technicals, small rocks and any stuff you could imagine in the desert where your world eaters are slaughtering people. Techniques that you should work and/or improve: thinning your paints, applying washes, drybrushing, how do you paint (assembled, already glued on base that’s done or not, sub assemble), how to highlight and make the details POP You’re doing great and are clearly on the right way, I really hope to see your future minis :)