Look at your timeline in your editing software. Is there an audio track that starts at the beginning, and continues—unbroken—through the very end of your movie? Get out that razor tool and chop it up. Wall to wall music is unnecessary, and hurts my ears.
Your Awful Short Film
Notes from a festival pre-screener who is trying to help you. Honestly.
With great debt to and inspiration from screenwritingtips.tumblr.com