As human skin is semi-transparent in nature, it consists of multiple changing colours. The blood is major factor for the base tone value. Regarding of the condition and the blood flow in an area, the place can change from pale pink to purple blue. The fat gives slightly yellow addition tot he mixture of red, blue and green, produced by the different type of veins and their density.
The colour study applies the basics of producing realistic skin values by combining of basic colours.
The light on both pictures is dimmed, due tot he time of the year. This provides the slight brighter effect when it reflects from the skin of the model. By nature, the overal gamma of the body is in the more yellow spectrum than any other. That is why base colours of yellow to orange and blue to green are mixed. The reflected colours from the drapery on the chair also mix with the skin colours.
Shadows are expressed as darker mixture of blue and red and a little bit of green. As the main colour of the paper is white, the RGB gamma is suitable to produce harder and darker combination needed for the shadows.
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