Here is the completed painting, for now at least. I spent a lot of time on the water and reflections, then the pond scum!  What was nice was that it was in both shadow and light, so I added some blue green to the shadow areas, and a pale yellow green to the sunlit pieces. The water at bottom in the photo was more blue green, but I used a Ludwig blue violet that I like a lot and I think it works. This is far from perfect but it does capture the scene, I think. Now I think I’ll go back to bed!