The correct answer to this open question is the following.
John Brown is portrayed in the artwork in the following way.
John Brown is portrayed as a leader with a determined attitude in a combat form. He is at the very front of the portray with his arms extended. In one hand, he holds a book representing legislation. In the other hand, he holds a riffle. Behind him, we can see soldiers fighting. In front of him, there are two laid bodies. This clearly represents his fight and opposition against slavery. This portrait was painted by Thomas Curry.