Thanks for the comment, Graham. The plant in the back left, as well as the one immediately in front of the twisty vine on the right side of the tank will both be getting larger (the left in the neighborhood of 20" tall and the right somewhere around 12"). As for the leaf litter, it's currently on backorder from NE Herpticulture.
On the note of more branches, I think we're going to wait to see how well the plants fill things in before adding too many more vertical ones. The possibility of horizontal ones is still being debated.