Sometimes you want your characters to go behind objects, a building in the background for instance. If you create your background in Synfig you can probably just place the character behind the object ...

When I import any image (like png) into Synfig, it looks really UGLY, while in Gimp it looks perfect. For example, I added some wind effect to a text and in gimp it's clean, but in Synfig it is a bit ...