I photographed this unusual Viburnum last year. I picked a grouping that was hanging with no backround interference. The backround was in shade and I used a fill flash to even out the lighting.
Nikon D300, 200mm Macro, ISO 200, F32 1/100, Flash set at -1 stop.
Beautiful image, Dave! I think you could play with lightening that bottom leaf just a little bit (maybe a shadow/highlight adjustment layer?) Overall, I think it's gorgeous...beautiful whites and love the deep BG that sets them off.