I listened to this album with growing irritation as I went through the tracks. Maybe someone agrees with the opinion I formed:
The lounge bar type of musical backing is cool. The voice is lovely. The mix is fine. Probably the words are good (my french isn't good enough to figure that out). What's missing is the way the words frame their melody - it doesn't fit with the music, and what we do hear is usually too weak in melody to carry a counterpoint. It's like hearing a poem that doesn't rhyme - sometimes it will work, sometimes it won't.
Now, if you have lyrics that wander about like that, they should have their own strong melody. Most of the time these lyrics don't. Not only that, Sophie's trying to fit them in to the rhythm of the song and a lot of the time it doesn't work.
Argh. It bugs me especially because there is potential there! But it needs a smart producer who can imagine the final sound to steer the talent towards that sound.
For what it's worth, here are my tips: try figuring out harmonies for the voice, and multitrack the voice to make that part stronger. Try mangling the lyrics so they fit the structure of the backing better.
It's not going to be applicable to many of the pieces, but thinking like that may help you lead the piece to a better outcome.
Looking back at this review, I realise I may have offended you. That is not my intent. I apologise for savaging your pieces like this - just please take it constructively. If you like, go ahead and savage my pieces in return. I'm fairly thick-skinned.