Ok, next print : I will close the sides and front with a piece of paper to test if it is better.
Thank you all. I will let you know.
DELETED by Pilou74
Yes, definitely an improvement! Always getting better 
You print this with enclosed printer or just make next calibration?
DELETED by Pilou74
In order to avoid any misinterpreting of my pictures by some people, I decided to delete them from this post.
Sorry for the people who enjoyed my post. I thank you all for your support. Maybe back some day, when everything will be setup properly.
Cheers 