I love your rendered image, the light and the bokeh is very well managed. But I saw a depth of field much higher (personally I'd use an aperture at f/11). What camera lens did you use?
I completely agree Kaz, However there's no way to control aperture - It's a poor mans macro - Using a reverse mounted 18-55 Canon kit lens. There's no electrical connection to the camera. (the lens is literally mounted backwards with a ring adapter)