To continue with the demo, here I am working wet-on-dry on the top part of the tree, leaving some negative shapes for the leaves. I have also started laying in cooler blue green washes for the mountains.
More work on the tree:
In the final stages, I have used the same green mixes, only lighter and a little less saturated on the distant land and trees. Put in some highlights for the shine on the leaves and lighter values around the edges of the tree and the sparkle on the water with white gouache slightly tinted with the watercolors. Hope you enjoyed it!