From my first effort with watercolor, my paintings were heavy on detail. Some people admired that; others recommended loosening up.
It's hard to loosen up when you are a detail person, and you can tell I am a detail person by the piles of sticks I've made in our woods; I don't want twigs and sticks littering my paths.
One day during the Clark County Fair I was scheduled to sit in a booth, so I brought along paint and paper. The bouquet of white tulips in the booth caught my attention. It wasn't exactly a plein-air situation, since I was indoors, but it offered an exercise in completing a painting in one sitting—a good way to force a painter to loosen up.
I don't suppose my "White Tulips" would win any prizes. It probably lacks some important principles of good art. However, I like it and it encouraged me to try more plein-air work.