I'm afraid that the grain and the choice of toning just don't work well for me. Neither effect seems to do justice for the potential beauty of the subject matter.
I normally like grain in some images when used for impact, but I think the grain in this image is a little too excessive. I think this may have been better with a more plain background, or a textured one, but some of the leaves are little distracting - mostly the top right and on the left near the flower. More contrast and less grain on the petals would have really enhanced it more too.
I like the grainy look of this photo, although I'm curious why given that you didn't choose to go with sepia. It looks good in B&W, mind you; it's a nice shot, the flower stands out well from the background and it's a good angle. But I associate grainy with old, and therefore am more inclined to think sepia.
Interesting. The top area of the rose is a bit blown, which would not help with me prefering to see a bit more light on the rest of the shot, to bring out more lines and depth to the shot