Isn’t the screen shot of the app just below the fold good enough? Or would you like to see the finished product. The quality of that would significantly depend on the person making it (how well they can cut paper, how well they can glue) and their commitment to quality (how hard they’re trying), so I think it would either oversell the product by showing something the average user cannot produce or undersell it.

I didn't use this app, but I did happen to make a paper moai mask recently using a pattern purchased from etsy.

https://ibb.co/BHcG4BkB