You got a good base going on! It's a bit on the short side, but I can imagine that time-constraints (and perhaps a lack of knowledge how to continue it - that is what I often have!) might have gotten in the way. Your three instruments - a drum, brass section, and melody - work well together, and the slow speed gives it a bit more of a soft boss-feel. I feel like a lot can be done with this, perhaps by adding another (background) instrument, or by extending it with more sections. Well done :)