I like a more reticent approach to music, and so cinematic scores that feature a lot of brass aren’t necessarily my favorite, but in my humble opinion, I think you nailed the atmosphere of a cinematic track.
This is nearly perfect, and the only reason why I say nearly is because…well… perfection isn’t really meant to be attained.
In the beginning, before the strings come in, it reminded me of Steve Reich’s “Music for 18 Musicians.” The type of reverb you have for the piano is exactly what I imagined for a piece with a title such as “eternity” to have.
And by the looks of it, you seemed to have allowed your art to mature before uploading on here which is quite respectable.