A major challenge for designers when drawing plans in 2D on paper is to be able to imagine that design in 3D and what it will feel like to walk through and sit in that space once it is built. Computer aided design (CAD) is a tool which many designers use as they can design in 3D and view the garden from multiple angles as they design it.
Look at this garden in plan view and then from the other two angles, it would be hard to imagine what all the different levels look like just from a 2D plan.
What did you discover about your design when you drew it from the different angles?