I wanted to create the image that looks like an inverted lamp, and went hunting around at Gardens by the Bay for the right "model". This daisy (I think) of Africian origins provided the look that I wanted.
The YN560II was set to a power of 1/32. A DIY snoot is used to reduce the light circle to about 1.5 inch when held about 4 inches above the flower. (NOTE: As this was taken in the garden, flash was handheld, so distance is rough estimate.) As it was a gloomy day, a shutter speed of 1/200 was enough to underexposed for a black background.
Photoshop is used to sharpen, increase the vibrancy, and adjust the levels for the final output.
5DM3 + Sigma 150mm Macro + 580exII + DIY snoot + Phottix Strato II triggers
No plants nor flowers were pluck, cut or hurt during the photography