finding a piece of driftwood that fits a nano is a challenge in itself. The pieces dont look all that big until you bring it home.
The fun in working with a small tank is to give the perception of a larger tank than it really is.
Have you considered rotating the driftwood to stand upwards? also moving the stone on the right towards the center?
Consider layering so the short plants are in the front and the tall plants stand towards the rear of the tank. The wistera floating up top would make for an awesome background plant.