My Opinion about Tragic Hero and Hamartia with the reference of The old man and the sea:-
About the Tragic Hero:
The tragic hero is a hero who has a hard life, he is able to sacrifice his life for the absolute perfection of his life goal, and he is an honorable figure in the any type of work.
The Tragic hero should be high degree that is a king, prince, commander, or the like he is affected by his actions and certainly by his downfall.
Tragic hero should be like a good, brave, powerful, superhuman, the tragic hero win at the end, good or moral values, or he is fulfill the desire of the readers and he is at the central figure of the work.
Example of the Tragic Hero:-
In the novel the old man in the sea we can find the real example of the tragic hero as Santiago. Though he is too old, he goes too far in the sea for catching the fish. He knew that he reached at far and it is also the dangerous for him yet he made mistake by going too far in the sea and for that he has to pay the thing by loosing the fish. His decision of going too far is his error of judgment/ hamartia for that he has to suffer and loose the fish.