That mustache does not look like it was painted by the original artist
There are also tears under his right eye, which probably also were not painted by the original artist. But I would still not call this vandalism, but rather an "extension" of a painting, because these are also arts, and they became the part of the painting. The "second painter" did not ruined, nor damaged the painting. He/she simply made additions to it. That mustache and the tears made the painting somewhat funny. Of course this depends on the viewpoint. This is my opinion.
Happy New Year.
Have a nice day and have a nice weekend.
All the best. Greetings and much love from Hungary.