Great job on the composition, I can feel a lot of emotion there. I'm so sorry to hear about your grandmother; I think that processing your grief and transmuting it into art is a great way to honor those who you miss.
I like the choices of instrumentation, and especially liked the ending of the composition. I would highly suggest making a simple video with your composition on it (can just be with the theme picture) and uploading to YouTube and adding the video as a "trailer" (I think it is not too late for that, you can just click "edit soundtrack" on your page and paste the link.) A lot of people may skip listening to your composition because they don't want to download it, and streaming it is easier, and I think it deserves to have as many listeners as possible :)