I think the piece is really gorgeous, definitely lends itself to repetition (as I mentioned in my SoundCloud comment). If I were being as critical as possible, I'd say the only thing that *might* have a positive effect is have the legato transitions between string lines being ever so slightly smoother. I suppose that's more of a comment geared towards the specific string library you're using than anything else! I'm thinking, though, that if you have one line every so often use a portamento slur, but mostly just using a clean legato patch (on at least the highest-playing string line), you could add just that extra little touch of realism.