this is a very good interpretation of this track
I think that at :16 when the lead comes in you should lower the volume on the harp, and bring the lead flute out a little more. from about :44 to about :48, to add to the balance, you can add a decrescendo then bring it back up to the same level it was at earlier at :58 your drums become boring after listening to more than 3 phrases of the same beat, you should mix it up some it'll add some more flair to it. Mostly work with your dynamics, right now you whole song is at one level, bing down to piano at some parts, then crescendo to mf, and so on play with it see what you get. lower your durms, raise the lead. but definitely bring that harp down after a while, it has a good supporting rhythm but. But as far as your instrumentation goes, I think you have a good filled out song,
so basically work with your dynamics, and mix your drums up. it'll ad more of a flair to it.
also like with your harp you can add little differences in your velocity so it sounds more like a human playing it and not so much like a robot and you can slightly (very very slightly) take a few notes and move them out of perfect sequence.
hopes this helps