"Colour tones" refer to the different shades and variations within a specific color. It describes the different levels of brightness or darkness that a color can have. Full definition
The subtle colour tones of cream, brown and grey work wonderfully. (hisforhomeblog.com)
The colours looks very unnatural, and is particularly noticeable when looking at people, or anything with flesh coloured tones in it. (androidauthority.com)
Take inspiration from colours outside and go for warm colour tones, try a burnt orange or dark yellow to add a fun statement to a room. (mummymummymum.com)