This to me looks like it would have been a perfect candidate for using a gray card, so that the overall color balance was dead on.

In the first image the petals seem to pick up a fair amount of grays and looks a bit dirty.

The second image eliminates these and is better, but it looses details in the whites and looks a little blown out. (At least on my monitor) It also seems that the water drops disappear in this one.

The B&W with this subject just doesn't seem right, but that is just my opinion.