I'll hit on your specific issues. Even though I'm still learning my way through mixing/mastering, I feel the overall tone of everything is slightly bland. Honestly, I would just ask to brighten up some things going on in the background to help them punch through more easily and be heard (but not overwhelmingly).
Personally, the sax sounds good to me, but if that isn't satisfying for you, mess around with other woodwinds (specifically reed-based). Dunno, I just like the texture it adds to everything.
Now, some other things I wanted to say (though someone step in if I'm just flat out wrong). The drum section at the beginning sounds overcompressed (but it could just be the type of reverb you have on it). It also sounds fairly prominent (when in a legit orchestral set-up, all percussion sits in the back. Again, I could be wrong, but I'm just remembering the setup from back in highschool), I would want to hear that fall back a bit to fit it's positioning.
I also would like to hear the actual solo's come forward a little bit. That can range from making it play louder, or making the orchestra itself back down in volume a bit to help boost the solo itself. And yes, lol, the ending is a bit sour.
But as a whole, I like the mix. As it was said by Rozovian, it's definitely conservative, but that isn't necessarily a bad thing. All this really needs is some tlc and a slightly better ending. Keep up the good work yo, looking forward to the finished product.