What's to say? You did a great job. It could be a little bassier, and around the 1:10 mark, it seems like it would be appropriate to have some electric guitar in there, but otherwise it's very well done. If you wrote this for yourself then keep it the way it is. It's perfect. However if you wrote with the intention of selling it to a trailer house or whatever, then take a listen to a lot of current movie trailer music. You will see that this style is becoming less popular (but of course still equally as good).
Check out the new Robin Hood trailer. A few years ago this music would have been perfect for it, but now it's a big rock track for a film set hundereds of years ago. Strange, but that's how it is. Anyway, amazing job. Would love to hear more.