I really liked your mix balance, each thing is dry and separate. And it's really a classic tune you are covering, great to hear all the things you did with your rendition. Background vocals were a definite win here.
That said, I wonder what microphone you used for the main vocal? I don't think it brings life into the vocal - which sounds very "effected"compared to the rest of your instruments.
Did you filter or eq the vocal? Or did the mic just limit the range it was capturing? Was it a dynamic sm-57 type deal? Maybe I'm used to hearing condensers on vocals. I think condensers give a little bit more air or something.
still, great job on a great song.
cheers,
-Tom