Working back to front, I have refined the background mass of trees, trying to keep the edges soft so they don't attract too much attention. I want them kind of blurry since they are not the center of interest.
The reflections in the water suggest that there is some movement in the river. The river would reflect the entire mass of trees if the water were calm. I'll add a few ripples later.
I have also put in some foliage on the large park trees, letting my brush dance to shape the leaves. I always enjoy doing that since it is lively and animated. I think it makes the leaves look more alive.