I went out yesterday and sat beside this local biking/walking trail and did this painting on site... I put the bicyclist in when I got back home.
I didn't have any yellow paint left in my portable palette, but I did have a yellow watercolor pencil to help create the bright yellow-greens. It worked out nicely.
I also messed up the drawing of the bend in the road and realized I did not have my kneaded eraser...so I packed everything up again, trudged back to the car, grabbed the eraser and trudged back to my painting spot.