I really like the sharpness of the ring and the area around it. What I don't like is the transition the hand has with the background. The out of focus part doesn't bother me but the difference of color does. As such the diagonal line it creates takes too much of the focus away from the ring. Maybe if the background was black the transition would look better and being black it might also enhance the elegant nature of this photo and make the hands pop out in general being that it's the lighter color.
I like the blank background, it emphasises the focus on the ring, and points out that, at that moment, nothing really matters apart from what the ring symbolises, which is of course invisible ...in that respect I think you've taken a photo of romance itself rather well.
Since she's already wearing the ring I think that a caption such as "She Said Yes" or "I Do" would have been more appropriate. This is a nice, stock-like image; it looks almost like a jewelry advertisement.
I like all the empty space - it is the visual equivalent of a question - the fingers line up nicely on a diagonal that emphasizes the ring and leads the eyeeither to it or away from it perhaps depending on the answer to the question. I am not sure what the brown object the hand is resting on is - it distracts my eye and does not add to the picture. Nice use of shallow DOF and nice focus. Wish the shadow falling on the finger below the ring might have been reduced by another light or a bounce.