This challenge (not competition) was an exercise / practice to find the sweet spot between light and shadow with only black and white colours. 

This is warmly recommended to practice to get that better control of contrast and get smoth blending, as if you add more colours, it is harder to see. 

The figures are Scale75 and are 1/10

Stanley (left): painted by me

Hardy (right): painted by @scaledreamsfrommybench 

Personal notes: Just using 2 colours is a great method to learn and embrace the shadows and highlights. It is important to take pictures continuously and look at those  and not the model as the brain tries to trick you - bloody brain!