Terracotta is having a real moment right now, and a study is the perfect place to use it. Dawn Terracotta on the walls feels warm and a little earthy without going loud, the kind of color that makes you want to sit down and stay a while.
To keep it from feeling heavy, I paired it with a Soft Greige for the trim and ceiling and a clean Quiet Linen White for any cabinets or built-ins. Those two lighten the whole room and let the terracotta breathe. Walnut Earth is your wood tone, so think floors, a desk, or open shelving that ties back to the warmth on the walls.
The one I would use sparingly is Deep Clay. It is the richest color here, so a little goes a long way. Try it on the back of a bookshelf or a single piece of furniture, and let it add depth without taking over.