avatar not showing

Have you created your Gravatar profile (using the same email address you use for your WordPress) at https://en.gravatar.com/ ?

If yes, can you post the URL to your website?

Yes, I’have created my gravatar, the address is the same I use for wordpress.

Here the URL to my website:
https://psyta.net/?p=73

Have you tried previewing one of the default WordPress themes? Twenty Fourteen or Twenty Thirteen.

It may be that your current theme is causing the issue.