I changed my ending recently, first, after showing my animatic to different people, I got some feedback and advice about it. So I deleted or changed some shots to improve and clarify my animatic.
Firstly, The ambulance showing in the end seems disconnected to other scenes, which are likely unrealistic. Secondly, I showed some hints about butterfly cocoon before the last part, and then many butterflies fly out of the house in the end. As a butterfly has special metaphor in many films, it is clearer to illustrate flow of time and changing. Although I had beautiful images about many butterflies in my mind, it may difficult to present that the main character is leaving. And it may meet technical problems about many butterflies. To clear plots of the film, I changed the final scene and reduced some character’s performance.