If you added some small percussion it would really add effect and still keep it calm. The ending was not good though. The high note threw off the point of the song. Good work though. Maybe you could add a bass guitar instead a double bass symphony sound. It would make it clear and let you relax and not listen to the warp sound of too many low strings.
I found percussion a little hard to incorporate, as it seemed to take away from the strings. I only used strings, no actual bass was used. Bass guitar sounded a little weird, but I'm going to continue to work on it, I uploaded this version for feedback.