https://www.cutoutandkeep.net/projects/how-to-make-a-camera-obscura • Posted by Samantha M.
Cover the windows in black card - doesn't matter how untidy it looks as long as you block out all the light. Then using the pin make a hole- you may need to widen the hole -just widen it until you start to see the upside down image of outside and it will become clearer.
Enjoy the results, you can photograph the results if you wish- here is an artist that does that : http://www.abelardomorell.net/photography/cameraobsc_01/cameraobsc_11.html