First impression: I love the clarity of this image. It's very sharp and clean. The lighting on the rose also helps to bring out it's texture and color while reflecting perfectly in the dew drops.
I think the previous comments pretty well hit the nail on the head. The contrast is OK, but the cropping could be a bit better. The white object in the background competes with the rose IMHO. I've sat on this image for a few days trying to think of a better critique, but honestly I don't see much to critique about it. It's a great capture and other than the couple of things pointed out in previous comments, I see nothing wrong with it.
Simply stunning clarity and natural colors. Truly a magnificent shot. Good DOF and I like the offset composition horizontaly, but think it could be offset a bit vertically as well. Strong entry.
Nice perspective and color on the rose. Just enough water drops, not overpowering. Maybe a tighter crop on the rose would be nice. The upper left white area in the background is a little distracting.