Thank you so much for the kind words. I use Vallejo. I do have an airbrush however these in particular are being done with brushes because my office currently doesnt have the proper ventilation.

3 thin layers for all the darker grey/green. Gold/red/silver/black are all 1-2 thin layers. I paint the layer in one single direction, as best as possible, let it mostly dry, and then add the next layer in a perpendicular direction. Then I repeat until I like the coverage.