I placed one canon 550 EX on the right side of the flower with a self made diffuser ,the power was set to 1/32 35mmzoomed +/- 50cm to the right. The diffuser was an old salat bowl.I made a hole in the bottom the size of my canon 550 EX.. I cut a piece out of a translucent bag the size of the cover and put it down to the cover
On the left side a placed a selfmade reflector with a YN560 to reflect the light, the power set to 1/64 35mm zoomed +/- 50cm
After a little playing with the composition and a some conversion to B&W in lightroom this are the results.
Camerasettings of my 60D with 50 mm nifty-fifty lens were 1/160th sec-1/250th sec F7.1 to F11 iso 100. When I changed the aperture I also changed the power of the 550EX because this was my mainlight.