Designers often rely on this proportion:
60% of the area should be occupied by the main color. Usually this is the finish of the walls, floors, ceilings, and large pieces of furniture.
30% corresponds to the basic tone or neutral color. This could be one of the walls, curtains, chairs, sofas and other furniture.
10% for arranging accents in the form of posters, decorative pillows, hanging shelves, brightly colored plafonds and chandeliers. They require the acquisition of the interior of their own character, make the room special, and at the same time they are easy to update if necessary.