I constructed one over the weekend, using a carboard box, bristol board and cheesecloth. Followed the instructions of shooting at close range, no zoom, using the portrait setting. So far the photos have been kinda meh. I posted a few in the Fantasy section, here's one of them.
The figures are much darker than they should be. I had to lighten the picture in photoshop, even then it looks dark and grainy. One possibility I thought of was the time of day. I've been shooting these at night, in a well lit room, with the full spectrum lamp directly over the light box. Still they don't look better than the photos I shot during the day without the light box, such as this vampire.
Any tips on improving my pictures. I've been using Adobe Photoshop and a Cannon 3.2 mega pixel.