I haven't done photo work in way too long but the first thing I see is a need for a second light source, either another lamp or simply a couple of white reflection boards near both sides of the camera lens.
Most of the home made light boxes I have seen were big translucent white plastic containers with a hole cut in the bottom for the camera lens to poke through and they had two bright light sources on either side.
Suggestions from a novice and worth what you paid for them.
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The Zombie Apocalypse is Upon Us.
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