My opinion
I think its perfect, you just need to lengthen it, make 16 bar verses and a few choruses (the corus im guessing as the big strings part).
So just lengthen it man. Maybe add a little violin in the background that goes with the melody (piano) but nothing that would drown out the soft feel, or interfere with the strings on chorus.
Good luck.
XT (Down N DIrty)