Hi Kari, This is a very nice photo and a good choice for the challenge. I think that you recognised the need to submit something a bit different and you have done very well. It is good to try and tell a story with your photo, leaving the viewer wondering why this rose has been left in the water.
A photographer once told me that if you take a picture (or rather line a picture up in your viewfinder) you should only take the shot if you can think of a title for it. i.e. If the picture has nothing to say, don't take it at all. Interesting advice. (Personally I still snap away like a terrapin on speed, but I keep telling myself that this is all part of learning what the camera can do..)
Tecnically this is a good shot also but I would suggest that a greater angle of the rose might have helped (as per digitalknights suggestion) To me also the leaf at the back is a slight distraction as it looks at an unnatural angle.
The only other thing that maybe could be improved is the reflection of the water itself. I am not 100% sure I like the look of it (not sure why) Have you tried using a polarizing filter over your lens (is this possible on a DMC-FZ30?) this would help reduce the glare and darken the water. IMO this migh make for a stronger background.
Overall a great photo. I think the sharpness and saturation work very well and are in keeping with the title.