Myserious and beautiful!
Sounds almost more like Ambiance at some parts, but I reckon classical fits best.
My only constructive feedback is that at 0:56 when the strings die out, have some sort of fade or transition (cymbal roll?) to keep the energy or it all just dies right there.
A flawless piece theory wise in my opinion. Expressive yet mysterious, I like it!
Keep up the good work!
-Samulis