Great work. Not having composed orchestral-scale yet, I'm not really one to give you great tips about improving. I do think, after reading Jair's post, that I could have used a little more solo development of the melody ideas, but perhaps there were times that you had solo sax w/ orch and the balances were just off on the midi, making it sound like tutti. The solo spots I did hear were very natural, yet restrained and classical.
Other good classical elements from what I could tell; the contrasting phrase ideas within sections that I noticed worked well together. Bravo also on overall structure.
The theme's treatment throughout was also good. 4:15 had a very nice broader rhythmic feel, and I liked the surprise at 5 mins., with the energetic tutti following
Keep it up.