The key to making a Christmas tree look full and lush is to start with a good foundation. First, choose a tree that is the appropriate size for your space and has a thick, full canopy. Then, when decorating, start with the lights and garland. Use a variety of lights in different colors and styles, and wrap the garland around the tree in a loose, circular pattern. Next, add the ornaments, starting with the larger ones at the bottom and working your way up. Finally, finish off the look with a topper.