I've started adding the water and reflections. I used a mixture of phthalo blue, dioxazine violet and sap green for the reflections of the trees in the water. A more intense mixture of the violet and ultramarine blue were added in the middle and I lifted out some whites in the water.
To show a contrast between the trees and buildings I decided to use a complementary color. I've added a dark red roof to the buildings and a red canopy to one of the boats.