That harsh shadow ... was there a leaf right underneath, and has the sun created the shadow? Hang on! That's no shadow at all. That's another petal underneath! It confused me lots, since all the other shadows fall in a different direction and I was wondering how you could have come about that "shadow" with "only natural light". But it IS no shadow... silly me!
Shadows were from the sun and a branches that were swaying back and forth. The lower petals do look like shadows, didn't notice that until you said something. Thanks for the comments.