One of basic rules for decorating is that you should decorate around one focal point inside your room. Living room like this, which features sliding, large glass doors along with view of trees and garden outside, should decorate for taking advantage of this view. You should also take care of a fact that this door is a medium to access garden then choose and arrange your décor accordingly. Create one living room, which not just shows off garden of yours, but invites you to enjoy it outside.
Watch light change inside room over course of one full day. Sunlight reflecting from garden will change the way décor items and colors look in room, as will garden lights, which you have placed at night. Now think about the look of your room, how you like it to be during night and daytime. Choose colors, which enhance rather compete with outside colors. Bring outdoors in, add personal touch or details and avoid cliches.