I'm tinkering with the idea of black and white figures with my current build and experimenting with a technique I read about in a garage kit 'zine a long time ago. It starts with undercoating in black first and slowly building up with very thin layers of white. Hypothetically, if the white is applied lightly enough, it will allow the black to fade into different gradients of grey. Building layer after layer will eventually shift to purer tones of white over time. Final highlights can be punched in with a brush loaded with pure white.
Try to grab a screen shot of your subject for reference - it's a lot easier to work from a still print taped over your bench.