It's important to create space for people to be able move in and out. Or else it gives the sensation of being trapped. Creating a flow in room is important for a successful interior design.
Choose a consistent color palette to create flow from room to room. That way it feels easy, styled, and comfortable.
To keep your interior design visually interesting, add textures. When you go tonal go texture.
Plants add texture, dimension and height. They warm up a space and have many health benefits.
Details like books, candles, vases etc. matter. They may be little but they add so much to a space.