I like the feel of the piece, especially the use of percussion.
What library are you using? The strings sound synthy, and the sustained notes make it even more obvious.
I'm thinking maybe more movement in the lower strings? Also, there are a lot of long sustained notes--maybe having shorter and more rhymic accompanying notes/instrument will create more variation in the piece.
I like it. I'm really not qualified to give you any advice yet as I'm still learning many things about music (I just started my hand at producing less than a year ago). I do feel it could be made to sound much bigger though.