I don't have a problem with the instrumentation.
The bass could be edited to be simpler and less "busy" - particularly in the earlier section or a different bass imported.
As a piano ballad this has pretty much all the elements needed...a fabulous song, a convincing vocal performance, a piano with chords and arps that describe the melody as well as support it.
Nice.


Cheers
rayc
"What's so funny about peace, love & understanding?" - N.Lowe