Not by hand, the different colors in these images are from different settings in the "Rendering" menu on the right, in the "shader" section. The top white/pearly images are "PBR" setting in shader and "Venetian Crossroads" in environment. The green is "matcap" (default) setting in the shader and a "green" in the skin settings. The blue/pink/purply trippy ones are "normal shader" setting in the shader. Thanks for posting about this program, it is super cool!!!