I’m not a big “skull art” fan, but I dig this photograph of a wee butterfly (or is that a moth?) landing inside the eye socket of a human skull. The image, by photographer Marko Popadic, is called Oko (Polish for “eye”).
HUES are the 12 purest & brightest colors with Primary Colors, Secondary Colors, and Tertiary Colors. TINTS (aka Pastel) is any color with white added. SHADE: any color with black added. TONE: is created by adding gray.