The idea is to build on one another's contributions and be open to possibilities, much like what happens in improv. For instance, there were times where I was intending to turn a particular curve into a vase, but the others on the team had other ideas, so I had to be flexible when it came to my turn to draw and adapt to the new info I was given.
It's actually a very useful exercise in learning to be adaptable, flexible and creative. I tried to honor each of the lines that were drawn, meaning not covering them up, but instead, build upon the lines to add to the "scene".
So this is what we ending up creating as a team. I finished the image by adding color and final details. Turned out pretty well!