This is cool!
You should try to shorten that silence at the intro Does the intro have any relation with the song by the way (all the section 'til :30)?
At 0:57 it'd make more sense to have the piano make a faster trill. The current one sounds odd because it is too slow.
Is the fade at 1:04 done using velocities or with the volume fader? I feel it sounds slightly fake...
At 1:47 aren't there some timing issues between the piano and horns?
The piano section at 2:09 is very cool, gives a nice feeling. The crescendo afterwards is also nice.
The section at 2:33 is good, but a little muddy. I feel you should lower the piano volume there, since it's mostly doing ornaments and filler stuff. The instruments that are playing the melody are drowned by the strings and piano.
Nice use of the orchestra at 3:03! I like the progressions you used to return to the main theme.
I'm not sure but aren't there some timing issues in the following sections too? The piano seems a bit off a few times.
Section at 3:50 is cool, nice ending!
Overall, the arrangement is very good. I'm not a classical musical expert but I feel the arrangement nails the feel. There are some slight issues with timing and the "realness" of the piano though. Also, some of the more crowded sections are a bit muddy, maybe you can play with panning there to free some space for the main melodies.