Drawings Featuring Various Shades of Gray - Living in a Monochromatic World

The drawings done in muted grays appear to depict complicated emotions by repressing color, don't they? It also takes a lot of skill to convey that through shading and gradations. Perhaps as a result, you are soon drawn in by the world's distinctive atmosphere and gloomy lighting. 

YoRHa No.2 Type B and YoRHa Type A No. 2 (from NieR:Automata) look like they're smack dab in the middle of an epic grayscale battle. 

Have any of the monochromatic masterpieces below brightened your day?