Finish Your Tree Shape
Work your way around and up your tree to the top adding slightly shorter pieces of lycopodium to each layer. Try to keep your tree from becoming too dense at this stage, you can always go back and insert more pieces later to fill in.
Make sure you are inserting the lycopodium all the way to the centre of the brush, and that your branches are emerging from the tree like the rays of the sun in a child's drawing, all heading out from the centre.
When you get near the top of the tree, pick a strong piece of lycopodium as the tree top spire, and glue it to the top end of the brush/tree form. Then add a few smaller pieces of club moss growing upwards just below this tallest point. Real trees have branches which grow up at the top rather than out.