I`ve just started doing the foreground roses. Some of them are in deep shadow, especially the one at the extreme right, so I`ve put in an orange wash for them (with some yellow at the centres). Even though we would expect shadow areas to be cooler, here the ones in the sunlight are reflecting the blue light from the sky and they look cooler (i.e. pinker) than the ones in shadow.
Strengthened the base colors here:
Put in krapprot tief (red madder dark) for the roses in shadow. This color, looks quite bright when it is wet but becomes dull when it has dried, perfect when you need warm, red shadows. The previous layers of bright orange lend luminosity to the roses even after the shadow color has been applied and they don`t look dead.
Started giving form to the individual petals here:
I`ve also used S cerulean blue tone for the shadows in the sunlit roses.
Watercolor Journal 