I find photographing flowers very difficult to pull off successfully (I have a friend who is very good at it, so I know it can be done).
Of these, the monochromes work better for me compositionally than the color one, and of the two, I prefer the second version, which is a little bit lighter and softer and thus has more of the feeling of a nice flower. The first feels just a tiny bit harsh, but the second is right on.