The clock/passage of time idea is a good one, especially to give it further meaning by suggesting death in your still life. The backdrop is a bit noisy/sharply defined - given that your foreground subjects are fairly close to one another and almost parallel, you could use a wider aperture and still keep your subjects in focus while making the background more blurred and less noticeable.
I really like the concept, the pic, but it does look like the cloning or wrinkle just left of the vase could have used some work. The lighting can be tough on a shot like this with the white vase and you did well. Good work.
Nice use of motion in still life. One suggestion is to have the dark image of the minute hand at the end of the range rather than the beginning probably by having a flash at the end of the 5 minute range.