Don't expect too much ! My experience in animation making is very limited.
I have made another walk animation, it looks slightly better but it is not professional quality either. And I feel I am missing something important and that it will not work correctly.
Here is a gif comparison of the two animations : https://imgur.com/a/Jxweg (I couldn't upload them here).
Somehow the texture placement is broken when rendered in Blender... It is displayed correctly in the viewport, though.