Instead, I decided to draw on aluminum foil. It was readily available to me and I can work on it without being dependent on the weather.
I used some thin-point markers to draw a peacock from my trip to Portugal. It was pretty fun to feel the "give" as I drew on the foil. It almost felt a bit like carving on something soft. I was fine with the outcome (the second photo above), but when I turned the foil over, I liked how it turned out more.
The texture of each pen mark showed up very nicely on the back and really gave it some personality. I liked the 3-D effect of the piece.
This reminded me to stay open to possibilities as I'm creating stuff and encouraged me to experiment with different surfaces for painting/drawing.