I take it your talking about photographing small objects in a light box and trying to get the effect in the picture. Right? Line the inside of the box with black velvet or even black spray paint. I'd use available light coming from behind me, such as a window, so face it (the opening of the box) towards the window. Just as you did in the other picture, but substitute the box for the barn. Move the box closer or farther away from the window to control your light.
The box you made with the tracing paper is used for "high key" lighting, where there are no shadows in a bright environment. You're doing the opposite now.

"(is shameless self book promotion allowed?)"
Rule 2: Do not spam. No blatant promotion, neither commercial nor non-commercial. No spamming, link-spamming or transmitting malware and viruses. If you want to advertise, do it on the Compare Deals section.
I don't think you crossed that line.

The book cover is just an example of what you're trying to do.
BTW:Nice shot.