How to make a large heart origami envelope

(page 2)

1st picture of large heart origami envelope

01.

Let us start with the paper's back side facing up.

Prepare to apply a vertical "valley-fold" and then "unfold" .

2nd picture of large heart origami envelope

02.

Apply the vertical "valley-fold" of the step #1 and then "unfold" .

Prepare to apply a vertical "mountain-fold" and then "unfold" .