Totally different generation, but I always get his melodies confused with those of irving berlin. Anyway, I have no ideas for you on the mix as it sound pretty nice as is. I like the tone of the walking bass...the vocalist has a nice breathy sound appropriate for the style maybe lacking in a little bottom end? I dunno...just trying to find something. A very nice subtle and dynamic mix.
I'm no pro... nor am i a drummer, and all i really have to offer is that i'd agree with BentRabbit .... it'd be nice to hear the brushes/snare a bit more in the mix.
this is really far from leonard cohen which is cool. he had a much more folky delivery and this is jazz bar material. she's got a great voice. i would bring the bass up more with more mid range boost. but really that's a nitpicky sort of comment. this sounds good.