That’s a painting of Augustinian Friar/Priest/Theologian and Professor Martin Luther nailing his Ninety-Five Theses to the church door in Wittenberg.
Careful, 2D:
from http://www.catholicculture.org/culture/library/view.cfm?id=788
]Luther’s]views of Mary as Mother of God and as ever-Virgin were identical to those in Catholicism, and his opinions on the Immaculate Conception, Mary’s “Spiritual Motherhood” and the use of the “Hail Mary” were substantially the same. He didn’t deny the Assumption (he certainly didn’t hesitate to rail against doctrines he opposed!), and venerated Mary in a very touching fashion which, as far as it goes, is not at all contrary to Catholic piety.
He is/was a Catholic priest, has a bad haircut, and didn't need that big a hammer to pound in 2 nails.....