What software are you using, because it doesn't sound like a very good one (No offense)
The piano sounds short, you should have it sustained, and the drums are really sucky, if you are using presets... don't. i made that mistake, they are obvious and sound terrible, especially for a sad song :(
Over-all this could use a lot of work, but that may not be possible if you are not using a good software like FL studio or garage band, ect.