It looks to me that you have a 2 pt hook up available, but each manufacture has their own 2 point system. I know that my Yanmar 2 point is MUCH different than what you have. I have a 2 point tiller and use it a lot. I do not have a picture which clearly shows the 2 point system hooked up, but maybe separate will help illustrate how mine works.
The 3pt lift link attach directly to the tiller and the nose of the tiller is pinned on each side to a cover over the PTO. On the picture of the rear of the tractor you will see the pins that attach the tiller to the tractor.
Mike