After reviewing the initial prototype sketch with Rameen, we decided that it was too thick and heavy-handed. Part of this was due to my struggle to master the Montana acrylic markers. It was difficult to use them vertically. The second prototype (on the right) was done using Sharpie markers and an AD marker. This captured the light feeling and looseness of the original ink pen drawing.
The bottom image shows the new prototype temporarily attached to the wall with push pins.