Progress is slow on this painting; working title 'Reflections'. It's complex. I hope I can get it right, to my satisfaction.
1. The birches are some in shadow, and some in sunlight.
2. The leaves on the bottom of the still pond only show up in the 'shade' of the dark trunks. They are richer, because they are wet, yet darker, because of the depth of the water. There also is some tannin staining of the water, making them tending to the brown.
3. The leaves floating on the water are lighter and brighter, but reflecting the sky, so somewhat bluer.
4. In addition, the sky is a deeper blue at the zenith, ie, at the bottom of the painting, than it is at the top.
5. And the trunks of the trees are thicker at the top of the painting, where they are closer to their own reflection, than at the bottom of the painting, where they reach up into the sky, away from the viewer.
6. If you are still with me at this point, add to this the leaves at the bottom of the painting are closer to us, so larger, and more flat-on to us, than the leaves at the top of the painting, near the edge of the pond, which are smaller, and foreshortened.
7. Let's not even start to investigate the minute reflections of each of the menisci around each floating leaf!
Phew! I think that's enough for now.