If you are adding leaves (parsley or AM) straight to the root I would add more thin branches. This approach is with individual leaf materials.
If you are adding something like lichen or bushy 'fill' material then you don't have to. This is more a mass cover approach.

In this photo I added lichen (the greener under stuff) to the brown limbs. Then I added individual parsley leaves on top of the lichen.
I think in yours you will need some filler branches for the leaves to be attached to. You don't have to use lichen, there are some great 'filler' branches that you can get from the dried flower section of your local craft store.
Don't forget to have fallen leaves on the ground.