This is a little experiment I made preparing the next scene of my project, which will comprehend a blacksmith forging some iron.
it is fine. Maybe some small sparkles coming from the hit would improve it.
-G
Yes, you’re right. I’m still not sure about a good way to make the sparks, but I’ll try. 
This might help: wiki.synfig.org/wiki/Particles_V2.0
It might be overkill for what you need but could be instructive, if nothing else.
Particles are a very interesting thing. I plan to experiment with them sooner or later, but I think I need something different for this scene.