btw I forgot to mention that I wrote and recorded this song. My daughter is the singer. A family story ... 

Thanks a lot thebiz.movies. To talk frankly the reverse effect is the result of a lack of imagination. I should have made a script, but as usual I worked in an empirical way and was blocked at the end. What will happen ? Since I didn't have any answer, I found this ruse.
I agree with your advice about improving expressions. I'm still learning, and it will help me a lot.

Lovely sets and good lighting.  I liked the reverse effect there at the end even if I don't know why it was used.  Easiest area to improve would be to add some expressions and move the character eyes around a bit.  They all looked a bit robotic/flat.  Overall very nice!

Bonjour tout le monde,
It took a lot of time for me to make this video. However I still learn techniques to work faster and better.
It's far from a professional product, but I'm happy with it.
Advices and remarks are welcome !

https://www.youtube.com/watch?v=8QHlVEcMoRE