Cut a long section of brown packing paper off of the roll, then tear or cut it into narrow strips. Crumple the strips to soften the look of the paper, and staple them to the tree trunk from the top.
Rather than working solely around the edges of the branches, position the lights so they shine from the inside of the tree as well to give the impression of depth and therefore the look of a fuller tree. Put the lights in place before adding ornaments, or other decorations, as these will get in the way.
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