For me, there is some contrast but other areas seem very similar in tonal values. Also for me, the broad white border detracts from an otherwise nice photo.
This shot has beautiful tones and I really like the composition & reflection. Great lighting too. The background has me a bit befuddled (is it a nautilus shell or a cave or what?) and the streaks on the reflective surface to the right of the shell are a little distracting, but overall I think this meets the challenge well and is very pleasing to the eye.