Wow, this is a great foundation! At first I wasn't sure about the vocals, but by the end, I was amazed at how much the vocals make the song what it is. I second the pizzicato standing bass and saxophone. It definitely needs more instrumentation to flesh out the soundscape. Great saxophone samples can be hard to come by; maybe you could ask around on here for a saxophonist to collaborate with? XPRTNovice is great! Maybe he would be interested?