Chorale Quando hic iturus A very good start. Overall, a piece that promises power. Lovin' it!
Judging by the sound of it, you're using Kontakt, and if I'm not mistaken, I do hear several EWQL libraries at play here.
A couple recommendations:
The reverb is a tad bit overwhelming and creates a lot of, for the lack of a better word, "mush." If you find a way to clear it up, faster passages will be much easier to follow, and the choral section in the beginning will sound a lot more powerful.
It's hard to really put a concrete nail in this next one, but a number of notes in the piece are accented too heavily and stick out of the piece in a rather unfitting manner. Take some time to go over the velocities of the notes, and you'll really make the sound pop!
The percussion overpowers the rest of the instruments. In addition to this, there are a number of moments in the piece where the audio is maxing out. Taking some time to work on mastering will significantly improve the aural effect of your work, e.g. everything from adjusting volume to utilizing LP and HP filters for instruments that have too much or too little bass or treble to allow them to fit in with the other instruments better without causing popping. Look into using panning to your advantage to "spread" the sound slightly away from the middle of the listener's position. It will make your orchestration feel much more full.
Overall, I love where this is headed and I'd really enjoy to see the finished product, as I understand this is a work in progress. Best of luck! :3
