Bronze statuette
 

Tell me who it is possible that the painting was, or similar?
Judging by the ornamentation on the chair may anyone of the ancient Greek thinkers?

Perhaps this is a collective image of the thinker, philosopher and poet, not necessarily specifically someone ...

Hardly.
The ancient Greeks did not have chairs.

It's someone dressed up in "old clothes", perhaps 18th century, there loved it.


Look for styles of furniture, then be able to more or less accurately dated.