An interesting perspective, and I think it works well. I think I prefer the monochrome. However, I would tone down the PP a bit. The original of the flowers that you posted second shows a perfect exposure, with no clipping, but in the B&W that you posted first, you've blown out the whites in the flowers:
I think that detracts--it's harsh, and because it is so much brighter than the top half of the image, it makes draws the eye (mine anyway) down and kind of fragments the image. I'd process this with less brightness in the flowers.