I think you got the speedy idea down already.
Zenithal prime into Contrast/Speed paint into light drybrush.
I do not have anything specific to reference, or help you directly with right colors or camo patters, but can offer general tips:
1 -
Zenithal prime then Contrast/Speed of your armor color over whole unit.
2 -
Use the color of the hair to paint the hair, and silver for metal parts.
3 -
Paint skin color where skin is needed
4 - (optional) A light dry-brushing/dusting of preferred light color or off-white over whole unit.
5 - (optional) Wash skin with thin thin pinky/peachy wash (ratios doesn't really matter as long as the skin pieces are are shaded/etched) and black wash for the metal parts.
6 -
Spray Varnish to protect pieces during game play
7 - (optional) Basing is optional but recommended. For me bases are fun and time consuming, but compensate in a powerful way for my mistakes and poor painting.
Camo is just a different way to apply Contrast/Speed during the
step 1. Instead of washing whole model with Contrast/Speed, unit is selectively washed with preferred colors in a preferred pattern.
Hope this helps.