I like the piece, but echo Mr. no999's comments about the hall. Also, the GPO :-( It's good from a far, but far from good... Try EWQL Gold if you can? Also, work on the cc codes for articulation/vibrato. And then finally, riding the faders to make it breath better (in conjunction of course with the instrument panning which I'm sure you've already done)
So Strings? (like this) should sit "Left to right" as they probably do. However, they should also sit "in the hall..." With some being closer (less verb) and some sitting farther away (more verb)
Then there's that whole tricky legato/vibrato/butter sustain thing? It all needs to breath and at the same time fit together? It's non-trivial... It takes hours/weeks of trial and error. But in the end? It's worth it.