When mixing and matching different colors within your tonal scheme, it's easy to get overwhelmed. You won't want the base color to make up most of the room, but adding in too much of the secondary tones can add visual clutter. Tom suggests using the 70-20-10 rule as a general guide.
Using your base color for about 70 percent of the space, and choosing other tones to take up 20 and 10 percent each can help you to create cohesion. Audrey, on the other hand, suggests a 60-30-10 ratio. But both designers suggest using these proportions very loosely – while they can be useful as guideposts, tonal scheme spaces offer a bit more flexibility.