I have my critical ears on. It's a very good cinematic composition suitable as an opening for any dramatic film IMO. There no arguing that. It's beautiful, dramatic and majestic.
Suggestions:
Do more versions of it. Maybe add a single instrument in the vary beginning and increase the length of the entire piece.
Criticism:
In the softer part there seems to be some distortion. Were some of the meters peaking? I thought that the really loud part would be distorted but it wasn't.
Were you using a lot of compression on the mix bus or on the tracks? Acoustic instruments usually don't require much compression. Maybe do some more mixing and mastering or have a mastering engineer or use the mastering on Soundcloud. Maybe do an unmastered mix and try it the Soundcloud options. The are free to try.
Conclusion:
That was a very good composition. I have a list of Indie filmmakers. I've written to a couple of them but none had the courtesy to write back.

Maybe compile a list of filmmakers and let them know what you do. Maybe you'll have better luck.