Artists are lucky. We can instantly "photo shop" anything to suit our vision as we paint. I did exactly that with the setup I was using when I painted "Harmony". Here it is:
When I looked at the reference without any color in it, my mind started to add some colors that weren't there. As long as I stuck to my values (dark, middle, and light), I could add any colors that came to mind, and the painting would read correctly. I also decided to simplify my shapes by using a very large brush.
In the end, my painting isn't a "portrait of flowers", but an "interpretation of flowers", which I felt happy with.