When the Joint Editor is open, the origin of the selected item will show as a green cross-hair, and the endpoint will show as a red cross-hair. When the cursor hovers over the center of a cross-hair, it will change to a circular shape, and you can then click and drag the cross-hair via the pointing device (mouse). You may find viewing through orthogonal cameras (Front, Top, Left, etc) makes exact positioning easier to achieve. You can also set the positions via the Joint Editor's numeric fields.

It seems that with real eyes, the pupils do not point straight ahead when focused on infinity, but instead they are splayed out somewhat. In Antonia Polygon, Jessi, and some other figures, the pupils point out to the side when the eyes are zeroed. In Antonia each eye is splayed out by approximately 5 degrees. In the P4 figures the the pupils do not point outwards.