12x9 is big for me. This one took a bit longer than I usually spend on a painting after work. When I got down to the river I realized that I had left all of my smaller panels in my trunk. I almost went back up to get one because I wasn't sure I wanted to commit to the time required for a bigger piece. ironically, I was too lazy to walk back to the car so I ended up spending more time on the painting. I'm glad I did.