You did a great job on this. I think the part where some of the band plays just upbeats (around 1:09) may be a bit difficult, but I think the percussion writing was pretty good. Just try not to overuse cymbal like from 1:41-1:47. I think it may be better to have the whole band play the melody at forte rather than just the cymbal crashes, but that's just me.
Overall, just know that beginning band writing is difficult and you are doing a great job!