A simple recipe I developed to paint an entire army, have it look great on the tabletop AND be able to add new units easily with minimal stress. The goal is people coming over to a table to look at the models because they stand out.
Ratios = (paint:thinner)
Zenithal off white (1:4). Directly above and on areas of interest so the contrast is dramatic and most of the model remains dark. Otherwise the underpainting gets too bright.
Underpaint dirty red from above (1:4)
Underpaint blue ink from below (5:1)
Drybrush bronze thinly over metal armour
Drybrush Kanoptec Alloy from above over shoulders and weapons (for golden highlight) + any regular metal parts (guns, tracks, etc)