It may look like I've not done any painting, but I have and quite a bit.....
The black areas have been painted in a craft paint colour called Liquorice, which in turn has been tinted with dark blue and then detailed with a pale flesh colour added to the highlights and applied in layers. The Shakos, backpacks and cartridge boxes have all been painted in this colour mix.
The full effect shows up in certain light and adds much needed 'warmth' to these otherise plain black areas.
Stay Safe (and enjoy the snow)