It is called Lo Spinario or Fidele. It is a sculpture of a boy pulling a thorn out of his foot.The info on Wikipedia can be found at en.wikipedia.org.
What Is The Famous Statue Of Man Looking At His Own Foot?
It might be a guess for the question is a bit tricky type. It's like one of those that always appear in our exams and leave us blank, when we start thinking about something that we never have learnt. Well for that was just a bit of an addition to my answer. I think when its that famous and it's a man looking at his foot. Then in my view its Jesus that he is having his head down and looking at his foot. It might not be accurate but was a guess just.
The Thinker by Auguste rodin
David
I am not certain but what I searched , shows that it is of Zeus . I hope it might be the one you are searching for. You can go for this link