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Nice pumpkin. Choki and I experimented with intricate carvings where the pumpkin was not actually punctured all the way last year. (Carve the skin, and part of the flesh out to varying degrees to make light and dark sections. When it's thin enough, the light will shine through the flesh, giving it a diffused look.)
I don't like the ones where the puncture doesn't occur and there isn't a lightsource behind it but I would imagine if the skin was shallow enough it would glow like you say but still have to have some kind of ventilation.