Who's the author of this painting ?

I do not know.

Seems like an accomplished artist.

Your use of the word "author" seems unusual. Usually the question would be, "Who is the painter of this picture?"

Sorry, English is not my mother language.
This painting sits on a wall in my parents' house in Romania for as long as I can remember ( I'm 46 ).
It is quite strange though that it doesn't have a signature. Additionally, it doesn't seem to be an oil painting, more like an old "copy" ... It does have an old and nice frame though. I am curious who the character in the painting is ...
Thanks anyways ...