Mary, thank-you for your very encouraging comments. I think the reason the painting looks sculpted is because the values are so close. I was once painting an arm when I was a student (I have attached the picture below plus a detail of "Leaning Figure"), and I mixed some flesh-coloured paint to get the colour, temperature and tone of the skin, and then added the minutest amount of cerulean blue for the inner arm, and the minutest amount of white for the most forward part of the arm and it created a really strong sensation of tactile three-dimensionalism. Also, I tend to rub in the slightly absorptive light areas (those that are not quite in the shade but not fully in the light, and scumble on the the highlights (and scumble on the highlights when the paint underneath is dryer so the white sits on top and doesn't get absorbed and lose brightness and texture).
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