You have great voicing of the melody, and are very consistent. Now think about this: each different harmony is a different mood, a different color or emotion. While consistency can be good, it will inevitably sound boring after time passes. I understand it's hard on an upright, hell I doubt I can do it myself, but I think you are capable of more than what you showed. You have a good foundation, now expand it! If you have trouble displaying emotions, a friend of mine told me he fits a story to his piece, to keep it interesting, and, as music is suppose to be, to communicate with people, based on our experiences. Tell your own, personal story through this piece!