Well,

This is very unlike Hans Zimmer in my opinion!

I think the most important thing you could do is add low strings, i.e. violincello and contrabass.
In terms of brass and percussion, Hans Zimmer is huge on french horns, timpani impacts and tom-type drums. Concert tom-toms, the bass drum, octotoms, djembes and dumbeks will add a huge effect to your music, especially if you want it to sound like a movie score.

Good luck, keep writing music!