For hanging pictures I really like to follow the midline style. In practice an imaginary line is drawn on the wall which is at 5/8 the height of the wall itself. Once we have this line in mind the paintings must be hung with 3/8 of their height above the median line.
h = (H*5 + q*3) / 8
where H
is the height of the wall and q
is the height of the painting itself.