The singer's got a great sounding voice, and the arrangement is really effective at creating a pretty setting.
Musically, this is
really nice.

But... For my aged ears, the intelligibility pretty low, and I have to struggle to make out what she's singing. The consonants /T/ and /R/ are so soft in places as to be non-existent. In some places the consonants are being swallowed up by instruments.
As I'm not your target audience, I doubt that's an actual problem needing a solution. And to reference back to Greg's post, that didn't really hurt Ricky Lee Jones, did it? And I had a heck of a time understanding what
she was singing as well.
Edit: On the off chance that you
did want to increase the intelligibility (and again, I'm not saying that's something you actually want to do), my first thought would be to do a bit of an EQ cut on the instruments around the 2K range. Unfortunately, that's also where the guitar lives, so that's not likely to end well.
The other option - a bit less intrusive - would be to ride the vocals to bring out the consonants. Or if you're into micro-editing (one of my bad habits) put envelopes around the plosives to give them a bit more clarity.
It sounded like the piano is sitting in the same space as your vocalist. I'm not sure there's a need to double the vocal in the piano, even though it
is a really pretty sound.
Anyway, feel free to ignore my suggestions. I'd take feedback from almost anyone over me any day of the week!