Step 11: Fold each corner over to the bottom left corner
Step 12: As you fold, your paper should look like this
Step 13: Keep folding!
Step 14: Press down your new folds to create this square
Step 15: Turn the square anticlockwise so it is now a diamond shape
Step 16: Fold the top layers of paper inwards to meet the centre crease line, creating the green crease lines
Step 17: Press the folds down and it should look like this
Step 18: Fold the tip of the paper down
Step 19: Your paper should now look like this
Step 20: Open up the folds so your paper looks like this