Again, Most Improved Forum Member of the year.
Your tune has some jazz and that coolness factor. Chord changes are pretty darn inventive. Kudos to your writing chops.
I would recommend considering doubling your vocal. Also, have you checked out some Fred Firth? His voice is in your same register, and you might enjoy listening how he processes it. YOu might some throw some bgv's in there.
https://www.youtube.com/watch?v=cFCML8N4fZE "Some Clouds Don't Have a Silver Lining"
That said, he did this on a four-track portastudio, so ymmv. :)
again, very nice tune!
cheers,
-Tom