At our office, we started a mural project by getting many people's participation, which paint on three 48"x48" canvas. And my role is to paint the back-drop of the mural. The photo above is the third canvas that would be placed on the right. I painted Mt. Rainier at the top part and everybody can fill the rest. The next would be the center canvas.
At least three - four times I changed the colors of left mountains and rocks in front of them. It's getting messier every time I change the colors. It's the time to stop. I wouldn't be able to improve any more.
Overall, it was somewhat disappointing outcome despite the fat I spent long time. Probably that's the main cause of the problems.
I think I've leaned something with this and need to move on.