I listened to your mix, matter of fact I'm still listening while I'm writing my thoughts. First off, the overall levels are good considering this is your first run through, I only have a few pieces of advice. I hear a slight amount of frequency masking going on with the vocals and the horns in some areas. The mix also seems just a bit muddy. Could this be due to and tape saturation that you may have used, or maybe even processed with some outboard analog gear to take of the crisp in the top end? I really enjoyed the separation in the instrumentation in the stereo field, great job in this area. I think with a little 5-10K boost in areas, and overall if done moderately thought some of the tracks, could really bring this out a bit more. Also, with the vocal, in some areas it seems as though a little micro automation would be beneficial especially in the more dense parts of the arrangements. Your post has really inspired me to mix this one myself and see what I can come up with. Great work, will be looking forward to more of your mixes.