Dahlia Flutes Purple, photo by Harold Davis. View this image larger
Two recent macro shots of a Dahlia reveal the structure and mystery of this flower viewed extremely close-up. Both were taken with my 50mm macro lens augmented with an extension tube.
As you can see, the light was quite different for the two photos even though they were taken over a fairly short time span. This is a feature (or bug) of the sunlight studio, particularly when capturing as the sun sets.
View this image larger.