Gilles, overall I enjoyed this vivacious, swashbuckling romp, well done!
If I may, I have just a few constructive criticisms to offer that I hope would lead to improvement of some important aspects of your production. These observations came to me as I listened for the first time, and I'm fairly sure about them now that I've compared your work to the published film score production posted in YouTube.
1. Reverb is a little too strong; one consequence being that the lead brass seems too far back in the mix. I'd try a slightly drier setting and perhaps add some pre-delay, to help bring the lead brass forward.
2. The opening low brass "bed" sounded very odd to me at first - almost as if it's single notes bent downwards at the end. In the published film score production this low brass opening plays extremely short, tight and snappy staccato notes, but in your production these notes are only barely separated if at all. John Williams' opening few bars here are very important in preparing us for the spirit of the whole piece.
3. Some of the accompaniment parts are a little too quiet for a film score - especially a blockbuster adventure film score like this one. (Unlike the world of classical music, Hollywood has never been about making people strain their eyes and ears to take in the "background", lol.) It could be remedied with level automation, but if that's a bit awkward, maybe try some upward compression here and there, maybe even on the master bus. (Upward compression applies positive gain at levels below the threshold. Only a few compressors can do this, but for example I think it's possible with Melda Production's free version of MCompressor - see the YouTube tutorial on making custom compression curves with this plugin.)
Overall though, your piece allowed me to savour and enjoy the pace, verve and excitement conjured up by Hollywood's own 'Tchaikovsky'. Thank you Gilles.