One thing I've learnt with flowers is when you go darker in tonal value the colour become stronger, more intense. Instead of the tones becoming more subdued in colour.
Getting the sunlight look helped with putting the light pink around the edges of the petals. It also made it stand out more against the background.
The background was an experiment. One of my students said this week so you've got to be brave when painting, yes! Sometimes you put a tone or colour on and it scares you :-) being so bright or dark. That happened today with the dark blue but it works and I'm happy!