Hidden self-portrait in history

Artists throughout the ages have left special signatures on their canvases, secretly inserting their own faces into their works in unusual and inventive ways rarely explained.
This gesture of the artist can have different meanings. Sometimes it is the signature or proof of technical mastery of the trade. Sometimes the author looks you in the eye, sometimes his gaze is elsewhere. In some cases, he sends us a symbolic or philosophical message from his inner universe.
Sometimes he demonstrates his humorous side.
‪@ArtSportNature‬