The melody in your first piece sounds out of place to me in some areas. Your other two pieces are strong for a novice, lacking a little variety but as they are intended as soundtracks you can get away with that. Great use of Vocals/choir, over-all there's some good work here! I wish I could pull of some of what you've done when I was starting out.
Keep at it, there's clearly a great composer within you!
On a side note may I suggest you upload pieces separately in the future to make it easier for other members to provide feedback.