like Harvey (78terp) said "... I hold the plant up in the air with darkness and shoot so that the flash is not bright enough to light anything beyond the orchid. I tape a piece of white paper loosely over the flash to soften the flash and keep the light from washing out the colors."

I experimented with " a piece of white paper loosely over the flash" and without. I used without, because I don't have a thin paper to cover the flash, most of my paper here are 80gsm (thick).

(That is why having a digital camera is soooo economical and dandy.)

Note: I'm still going to experiment with (onion skin) and without paper. because I still find the picture a bit bright, hence you can't see clearly the "blush".