Great song and performance. If I were mixing it I would:

1) generate two tracks of RT793 acoustic guitar, and pan one left and the other right. Not a duplicate but two different rendered tracks. Slightly wetten them too, and it will sound a lot fuller than the single guitar on the right.

2) Bring the bass up a bit, and maybe also the steel and cello.

3) Vocal is great. Perhaps a hair too dry for this style but don't over do it.

4) Would sound better if you ran Trackspacer on the acoustic guitars (especially) and probably the other instruments with a side chain on the great vocal, so that the vocal would sit nicely in the track but still have a full accompaniment sound.