The butterfly patterns can surely vary. Creating a more advanced one, with all the small little details is surely a task, that even a person very experienced with an art of origami can struggle with. Although, the butterfly pattern attached below is a pretty easy one, designed with total beginners in mind. The most optimal sizing is 3.5in x 3.5in, but of course we can either go for a smaller or bigger one, depending on our taste.
https://www.youtube.com/watch?v=nWjEYlMZnhE
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