Searching - Orchestral

[j7h18]

Enjoy this orchestral piece and tell me what I can improve on:

https://soundcloud.com/user-290071476/searching

[brandystarbrite]

Enjoy this orchestral piece and tell me what I can improve on:

https://soundcloud.com/user-290071476/searching

It's quite nice.
I find it interesting, how the mood changes for a while, from 1:29 to 1:40 secs.

Tip: While listening to the entire track, I could hear some strong resonance in it.
A good example of this, is from 2:20 to 2:27 secs, when that (sine sounding?) synth sound
comes in. It kinda sounds like a pulsating Wooooooooo, Wooooooooo sound.
Find some way to reduce it, or lower down the volume, of the sound that is causing it.

Also, maybe adding in a few more things, might help make this tune, sound more exciting.

[ChuensenMi3]

I am in no way an expert when it comes to music theory, however I think that the chord transitions should retain a little more harmony together throughout the piece; You did it successfully a few times, though, and I like the mood shifts you're going for. But the chords seem to be a little undecided and they don't successfully link the music as a whole unit. Now if I were an expert, I would be able to suggest types of chord progressions and key changes to utilize, but I'm not able to do so. I'd recommend listening to classical/orchestral music to get an ear for these things and study a little on music theory, if you'd like. Just my thoughts! Other than that, I feel like you have a potential soundtrack right here.