I like it. I must admit, the MIDI file of yours didn't play the pizzicato or the arco at the correct point of time all the time, put that is bound to happen.
But for what I have seen and heard, one of the few things I would have done differently, and I'm just being picky, m. 122 - 126 you have the 1st Violins over the 2nds, but for some reason, you turn it over for the 2nd violins going on top of the 1st violins. I would try to refrain from doing that, It's okay to do so in choral stuff, but I wouldn't do that in a string orchestra piece. And try to put in more dynamics, articulation and phrasing, to get just that right touch you want. Otherwise, nice piece.