Handmade with cardboard and latex.

The steps to make an excellent bookmark are: 1. Fold the square cardboard in half twice. Fold in half diagonally twice more.

2. Then fold the top corner downwards, and fold the left and right corners inwards as well.

3. Unfold the two corners at the bottom, fold them upward, and then fold the folded corners back down.

4. Then use latex to glue the prepared white strips on the folded bookmarks, and use a signature pen to draw the nose and eyes, and you're done.