First, if I remember MY flower anatomy:
The whole of the inside "parts" is the pistil. The little white "stem" in your photo is the anther (and filament) and the yellow part is the stigma. Not to sound like a nerd (oops, too late!), but if you're going to do much floral photography it does help to know what to call the parts. Google "flower anatomy" or "flower parts" and you'll find some good diagrams to refresh your memory.
EDIT: Actually, I misspoke. The anther and filament together make up the stamen. The REST of the innards (stigma, style, ovary and ovule) make up the pistil.
I get what you were going for in these photos, and I applaud your efforts to find a fresh perspective instead of just pointing at the flower and shooting. However, these don't really work for me for several reasons. This is all simply MY opinion, which is worth about half of what you're paying for it.

1. Just not enough contrast in the b&w, as others have said.
2. The orientation of these doesn't really work for me. It just makes me want to turn my head sideways.
3. Where you have chosen to crop the flower, for me, is kinda similar to cutting a person's limbs off in a photo. You've included enough of the flower that it really just looks like you accidentally cut the bottom part off. Either include the whole flower or make the crop more extreme. As is, I just want to see the rest of the flower.
4. When you're trying to get these "interior shots" as I think of them, where the anther and stigma are in focus and the rest of the flower is blurred, a different angle would really be helpful. If you want BOTH the anther and the stigma in focus, then you either have to get them both on the same focal plan, OR use an aperture that will get them both in focus. If you use a small enough aperture to get them both in focus though, you may end up with more of the flower in focus than you want. In this case, because only the stigma is in focus, I don't think it accomplishes the effect you were going for. Just experiment with different angles and different apertures and see what kind of results you get.