Pretty nice, try to work with the velocities of the piano so it doesn't sound as if a machine is playing it. Just try playing with them until you feel confortable with the dynamics. If you want i can use my piano samples on it (without changing notes, just velocities). Nice one.

I find this such a nice piece of music.
There's an urgency in the piano yet a longing and sadness in the strings.
Rather shit though, that this is all we get to hear!!!!!
Because a vocal was mentioned I'll give you my 10 sense worth : That wailing wench from one of Pink Floyd's tracks would sound good to this !