As a sometimes semi-professional calligrapher, I can also add that the mark of good calligraphy is also to move beyond mere motions of an oblique pen held at a constant angle. Really beautiful and pleasing shapes demand precise control of angle, tilt, and ink flow all at once.

Beginner: http://2.bp.blogspot.com/-dJuDu0cbH9c/UPXOvYUczGI/AAAAAAAAAq...

Advanced: https://i.pinimg.com/originals/c7/34/e8/c734e8ec3c19be54192d...