Lonely tree

Second outdoor painting attempt, I tried to focus on the edges, holding the brush by the tip, and using negative space in the tree!
I was not quick enough! The sun left the scene after 10 minutes..
I also tried something new by not following the rule of thirds for the composition.
I find my style not loose enough, maybe my strokes are too long, maybe I need to work on small touch of paint to get an impressionnist style.