Analogous color scheme

Definition:
any one of a group of related colors that are near each other on the color wheel, a circular chart that shows gradations of color

Explanation:
The two basic colors in this room are a slightly orangish-yellow and a tint of red-orange in the drapes and chair cushions. Even though orange is skipped, this falls into the broader definition of “analogous”, where the colors in the group contain a common hue.