Are you aware of f295 forum , there there are many pinhole camera plans including anamophic pinhole camera plans. You will like it and it produces super sharp wideangle pictures. I liked your picture , its a cool one.
Welcome to APUG and keep us posted with new pictures.
If you need a sharper image , may be lenox laser pinholes would help , they sell them around 30 or less dollars.
Anamophic pinhole camera is a tin can where the pinhole opened at the top not front.
As you know cameras generally put film in behind of lens.
This camera does it also but the axis of light coming from the pinhole is parallel to the film.
Try it at home , you will like the images
Let me give some links
You will like it.