In Soto style, we 'face the wall' ... we sit with our backbone at the center of the Zafu, perhaps slightly forward ... back straight, as if a tiny thread were running to the ceiling through the crown of the head ... give that thread a small tug, ever so slightly, to stretch the neck and pull the chin in ... your eyes should be 1/3 or 2/3 open (my teacher says naturally and fully open though ... the point is to remain present in this world and not drift into some dreamy state) ... gazing at a downward angle to the wall (or floor if that is all you have) ...
Aim for that, in a balanced Full or Half Lotus, or Burmese ... change things as necessary, but try for the 'ideal' ... There is no 'right' way or 'wrong' way at the heart of Zazen, nothing to aim for. Thus, please aim for the 'right way'.
Press on arrow for 'play'
TRY AS I MIGHT, THE 'CONVEX' SHAPE OF THE CAMERA
LENS DISTORTS MY SITTING POSTURE A BIT