I returned to the park, on a very sunny warm day. This time, I sat on another side of the fountain, in the shade, but somewhat at the same angle. I was in the shade but the fountain was in full sun.
I spent more than 60 minutes on this, probably more like 90 minutes to finish the tree details.
I used Golden Open Acrylics for this open air painting. It does not dry too fast, giving some time to blend even with the effect of sunshine and breeze.
It's an improved effort? I will continue to paint with this method. As the artist says "it is brush mileage that improves your skill."