19.
Apply two vertical valley-folds of the step #18.
Prepare to apply two lower valley-folds as well as two lower mountain-folds and then two upper valley-folds and two upper mountain-folds.
20.
First, apply two lower valley-folds and two lower mountain-folds.
Secondly, apply two upper valley-folds and two upper mountain-folds.
Prepare to allow the origami bear model to sit by itself.